diff --git a/scalafmt-core/shared/src/main/scala/org/scalafmt/internal/FormatWriter.scala b/scalafmt-core/shared/src/main/scala/org/scalafmt/internal/FormatWriter.scala
index 6e83449581..f3c09e1e91 100644
--- a/scalafmt-core/shared/src/main/scala/org/scalafmt/internal/FormatWriter.scala
+++ b/scalafmt-core/shared/src/main/scala/org/scalafmt/internal/FormatWriter.scala
@@ -371,6 +371,12 @@ class FormatWriter(formatOps: FormatOps) {
         else if (!x.formatToken.right.is[T.Comment]) false
         else hasBreakAfter(i + 1)
       }
+      @tailrec
+      def noAnnoFor(tree: Tree): Boolean = tree.parent match {
+        case Some(p @ (_: Term | _: Term.ArgClause)) => noAnnoFor(p)
+        case Some(p: Init) => !p.parent.exists(_.is[Mod.Annot])
+        case _ => true
+      }
       val style = floc.style
       val ib = style.rewrite.insertBraces
       val ft = floc.formatToken
@@ -378,7 +384,9 @@ class FormatWriter(formatOps: FormatOps) {
         floc.missingBracesIndent.isEmpty
       val mb =
         if (ok) formatOps.MissingBraces.getBlocks(ft, ib.allBlocks)
-          .filter { case (y, _) => checkInfix(y) && hasBreakAfter(idx) }
+          .filter { case (y, _) =>
+            checkInfix(y) && hasBreakAfter(idx) && noAnnoFor(y)
+          }
         else None
       mb.foreach { case (owner, otherBlocks) =>
         val endFt = tokens.nextNonCommentSameLine(tokens.getLast(owner))
diff --git a/scalafmt-tests/src/test/resources/rewrite/RedundantBraces.stat b/scalafmt-tests/src/test/resources/rewrite/RedundantBraces.stat
index ded5ec9cb8..997a84daf3 100644
--- a/scalafmt-tests/src/test/resources/rewrite/RedundantBraces.stat
+++ b/scalafmt-tests/src/test/resources/rewrite/RedundantBraces.stat
@@ -1714,3 +1714,37 @@ object a {
   ) = Def.task(session.checkTrackedSources(sources, dirs)) tag
     (ScalafmtTagPack: _*)
 }
+<<< #3912 insert braces in anno
+rewrite.insertBraces.minLines = 1
+===
+@ComponentScans(value =
+    Array(
+            new ComponentScan(
+                    value = Array("xxx.werr.werwer.fghfgfh"),
+                    nameGenerator = classOf[BeanNameGenerator],
+                    lazyInit = true,
+            ),
+            new ComponentScan(
+                    value = Array("xxx.werr.werwer.dsqrtybx"),
+                    nameGenerator = classOf[BeanNameGenerator],
+                    lazyInit = true,
+            ),
+    )
+)
+class WutAppSpringCfg extends SomeOtherStuff {}
+>>>
+@ComponentScans(value =
+  Array(
+    new ComponentScan(
+      value = Array("xxx.werr.werwer.fghfgfh"),
+      nameGenerator = classOf[BeanNameGenerator],
+      lazyInit = true
+    ),
+    new ComponentScan(
+      value = Array("xxx.werr.werwer.dsqrtybx"),
+      nameGenerator = classOf[BeanNameGenerator],
+      lazyInit = true
+    )
+  )
+)
+class WutAppSpringCfg extends SomeOtherStuff {}