diff --git a/src/poetry/puzzle/provider.py b/src/poetry/puzzle/provider.py
index 5da68aac353..2879fe89bee 100644
--- a/src/poetry/puzzle/provider.py
+++ b/src/poetry/puzzle/provider.py
@@ -555,13 +555,13 @@ def complete_package(
             if dep.name in self.UNSAFE_PACKAGES:
                 continue
 
-            active_extras = (
-                self._active_root_extras if package.is_root() else dependency.extras
-            )
-            if self._env and not dep.marker.validate(
-                self._marker_values(active_extras)
-            ):
-                continue
+            if self._env:
+                marker_values = (
+                    self._marker_values(self._active_root_extras) if package.is_root()
+                    else self._env.marker_env
+                )
+                if not dep.marker.validate(marker_values):
+                    continue
 
             if not package.is_root() and (
                 (dep.is_optional() and dep.name not in optional_dependencies)
diff --git a/tests/installation/fixtures/with-dependencies-differing-extras.test b/tests/installation/fixtures/with-dependencies-differing-extras.test
index d4c6d85909d..69827c4db28 100644
--- a/tests/installation/fixtures/with-dependencies-differing-extras.test
+++ b/tests/installation/fixtures/with-dependencies-differing-extras.test
@@ -4,15 +4,21 @@ version = "1.0.0"
 description = ""
 optional = true
 python-versions = "*"
-files = []
+files = [ ]
 
-[package.extras]
-demo-extra-one = ["transitive-dep-one"]
-demo-extra-two = ["transitive-dep-two"]
+[package.dependencies.transitive-dep-one]
+version = "1.1.0"
+optional = true
+markers = 'extra == "demo-extra-one" and extra != "demo-extra-two"'
 
-[package.dependencies]
-transitive-dep-one = {version = "1.1.0", optional = true}
-transitive-dep-two = {version = "1.2.0", optional = true}
+[package.dependencies.transitive-dep-two]
+version = "1.2.0"
+optional = true
+markers = 'extra != "demo-extra-one" and extra == "demo-extra-two"'
+
+  [package.extras]
+  demo-extra-one = [ "transitive-dep-one", "transitive-dep-two" ]
+  demo-extra-two = [ "transitive-dep-one", "transitive-dep-two" ]
 
 [[package]]
 name = "transitive-dep-one"
@@ -20,7 +26,7 @@ version = "1.1.0"
 description = ""
 optional = true
 python-versions = "*"
-files = []
+files = [ ]
 
 [[package]]
 name = "transitive-dep-two"
@@ -28,13 +34,13 @@ version = "1.2.0"
 description = ""
 optional = true
 python-versions = "*"
-files = []
+files = [ ]
 
 [extras]
-extra-one = ["demo", "demo"]
-extra-two = ["demo", "demo"]
+extra-one = [ "demo", "demo" ]
+extra-two = [ "demo", "demo" ]
 
 [metadata]
-python-versions = "*"
 lock-version = "2.0"
+python-versions = "*"
 content-hash = "123456789"
diff --git a/tests/installation/test_installer.py b/tests/installation/test_installer.py
index 2fa03590ca1..81619f79fd9 100644
--- a/tests/installation/test_installer.py
+++ b/tests/installation/test_installer.py
@@ -1027,110 +1027,6 @@ def test_run_with_dependencies_nested_extras(
     assert locker.written_data == expected
 
 
-@pytest.mark.parametrize("locked", [False])  # TODO: lock data
-@pytest.mark.parametrize("extra", [None, "extra-one", "extra-two"])
-def test_run_with_conflicting_dependency_extras(
-    installer: Installer,
-    pool: RepositoryPool,
-    locker: Locker,
-    installed: CustomInstalledRepository,
-    repo: Repository,
-    config: Config,
-    package: ProjectPackage,
-    extra: str | None,
-    locked: bool,
-) -> None:
-    """https://github.com/python-poetry/poetry/issues/834
-
-    Tests resolution of extras in both root ('extra-one', 'extra-two') and transitive
-    ('demo-extra-one', 'demo-extra-two') dependencies
-    """
-    # Demo package with two optional transitive dependencies, one for each extra
-    demo_pkg = get_package("demo", "1.0.0")
-    transitive_dep_one = get_package("transitive-dep", "1.1.0")
-    transitive_dep_two = get_package("transitive-dep", "1.2.0")
-    demo_pkg.extras = {
-        canonicalize_name("demo-extra-one"): [
-            get_dependency("transitive-dep", constraint={"version": "1.1.0", "optional": True})
-        ],
-        canonicalize_name("demo-extra-two"): [
-            get_dependency("transitive-dep", constraint={"version": "1.2.0", "optional": True})
-        ],
-    }
-    demo_pkg.add_dependency(
-        Factory.create_dependency(
-            "transitive-dep",
-            {
-                "version": "1.1.0",
-                "markers": "extra == 'demo-extra-one' and extra != 'demo-extra-two'",
-                "optional": True,
-            }
-        )
-    )
-    demo_pkg.add_dependency(
-        Factory.create_dependency(
-            "transitive-dep",
-            {
-                "version": "1.2.0",
-                "markers": "extra != 'demo-extra-one' and extra == 'demo-extra-two'",
-                "optional": True,
-            }
-        )
-    )
-    repo.add_package(demo_pkg)
-    repo.add_package(transitive_dep_one)
-    repo.add_package(transitive_dep_two)
-
-    # 'demo' with extra 'demo-extra-one' when package has 'extra-one' extra
-    #  and with extra 'demo-extra-two' when 'extra-two'
-    extra_one_dep = Factory.create_dependency(
-        "demo",
-        {
-            "version": "1.0.0",
-            "markers": "extra == 'extra-one' and extra != 'extra-two'",
-            "extras": ["demo-extra-one"],
-            "optional": True,
-        },
-    )
-    extra_two_dep = Factory.create_dependency(
-        "demo",
-        {
-            "version": "1.0.0",
-            "markers": "extra != 'extra-one' and extra == 'extra-two'",
-            "extras": ["demo-extra-two"],
-            "optional": True,
-        },
-    )
-    package.add_dependency(extra_one_dep)
-    package.add_dependency(extra_two_dep)
-    package.extras = {
-        canonicalize_name("extra-one"): [extra_one_dep],
-        canonicalize_name("extra-two"): [extra_two_dep],
-    }
-
-    locker.locked(locked)
-    if locked:
-        raise ValueError("no lock data for this test yet")
-        locker.mock_lock_data(dict(fixture("TODO")))
-
-    if extra is not None:
-        installer.extras([extra])
-    result = installer.run()
-    assert result == 0
-
-    if not locked:
-        raise ValueError("no lock data for this test yet")
-        expected = fixture("TODO")
-        assert locker.written_data == expected
-
-    # Results of installation are consistent with the 'extra' input
-    assert isinstance(installer.executor, Executor)
-    if extra is None:
-        assert len(installer.executor.installations) == 0
-    else:
-        assert len(installer.executor.installations) == 2
-
-
 @pytest.mark.parametrize("locked", [True, False])
 @pytest.mark.parametrize("extra", [None, "cpu", "cuda"])
 def test_run_with_exclusive_extras_different_sources(
@@ -1331,30 +1227,42 @@ def test_run_with_different_dependency_extras(
     extra: str | None,
     locked: bool,
 ) -> None:
-    """https://github.com/python-poetry/poetry/issues/834"""
-    # Demo package with two optional transitive dependencies, one for each extra
+    """https://github.com/python-poetry/poetry/issues/834
+
+    This tests different sets of extras in a dependency of the root project. These different dependency extras are
+    themselves conditioned on extras in the root project.
+    """
+    # Three packages in additon to root: demo (direct dependency) and two transitive dep packages
     demo_pkg = get_package("demo", "1.0.0")
-    transitive_dep_one = get_package("transitive-dep-one", "1.1.0")
-    transitive_dep_two = get_package("transitive-dep-two", "1.2.0")
-    demo_pkg.extras = {
-        canonicalize_name("demo-extra-one"): [get_dependency("transitive-dep-one")],
-        canonicalize_name("demo-extra-two"): [get_dependency("transitive-dep-two")],
-    }
-    demo_pkg.add_dependency(
-        Factory.create_dependency(
-            "transitive-dep-one", {"version": "1.1.0", "optional": True}
-        )
+    transitive_one_pkg = get_package("transitive-dep-one", "1.1.0")
+    transitive_two_pkg = get_package("transitive-dep-two", "1.2.0")
+
+    # Switch each transitive dependency based on extra markers in the 'demo' package
+    transitive_dep_one = Factory.create_dependency(
+        "transitive-dep-one",
+        {
+            "version": "1.1.0",
+            "markers": "extra == 'demo-extra-one' and extra != 'demo-extra-two'",
+            "optional": True,
+        }
     )
-    demo_pkg.add_dependency(
-        Factory.create_dependency(
-            "transitive-dep-two", {"version": "1.2.0", "optional": True}
-        )
+    transitive_dep_two = Factory.create_dependency(
+        "transitive-dep-two",
+        {
+            "version": "1.2.0",
+            "markers": "extra != 'demo-extra-one' and extra == 'demo-extra-two'",
+            "optional": True,
+        }
     )
-    repo.add_package(demo_pkg)
-    repo.add_package(transitive_dep_one)
-    repo.add_package(transitive_dep_two)
+    # Include both packages in both demo extras, to validate that they're filtered out based on extra markers alone
+    demo_pkg.extras = {
+        canonicalize_name("demo-extra-one"): [get_dependency("transitive-dep-one"), get_dependency("transitive-dep-two")],
+        canonicalize_name("demo-extra-two"): [get_dependency("transitive-dep-one"), get_dependency("transitive-dep-two")],
+    }
+    demo_pkg.add_dependency(transitive_dep_one)
+    demo_pkg.add_dependency(transitive_dep_two)
 
-    # 'demo' with extra 'one' when package has 'extra-one' extra and with extra 'two' when 'extra-two'
+    # Now define the demo dependency, similarly switched on extra markers in the root package
     extra_one_dep = Factory.create_dependency(
         "demo",
         {
@@ -1373,12 +1281,16 @@ def test_run_with_different_dependency_extras(
     )
     package.add_dependency(extra_one_dep)
     package.add_dependency(extra_two_dep)
-    # We don't want to cheat by only including the correct dependency in the 'extra' mapping
+    # Again we don't want to cheat by only including the correct dependency in the 'extra' mapping
     package.extras = {
         canonicalize_name("extra-one"): [extra_one_dep, extra_two_dep],
         canonicalize_name("extra-two"): [extra_one_dep, extra_two_dep],
     }
 
+    repo.add_package(demo_pkg)
+    repo.add_package(transitive_one_pkg)
+    repo.add_package(transitive_two_pkg)
+
     locker.locked(locked)
     if locked:
         locker.mock_lock_data(dict(fixture("with-dependencies-differing-extras")))
diff --git a/tests/puzzle/test_solver.py b/tests/puzzle/test_solver.py
index dcad15bca7d..ae99da5b0f5 100644
--- a/tests/puzzle/test_solver.py
+++ b/tests/puzzle/test_solver.py
@@ -4718,9 +4718,8 @@ def test_solver_resolves_duplicate_dependency_in_root_extra(
     """
     Without extras, a newer version of A can be chosen than with root extras.
     """
-    constraint: dict[str, Any] = {"version": "*"}
-    if with_extra:
-        constraint["extras"] = ["foo"]
+    extra = ["foo"] if with_extra else []
+
     package_a1 = get_package("A", "1.0")
     package_a2 = get_package("A", "2.0")
 
@@ -4735,7 +4734,7 @@ def test_solver_resolves_duplicate_dependency_in_root_extra(
     repo.add_package(package_a1)
     repo.add_package(package_a2)
 
-    solver = Solver(package, pool, [], [], io)
+    solver = Solver(package, pool, [], [], io, active_root_extras=extra)
     transaction = solver.solve()
 
     check_solver_result(