Tested on a test host with this latest 1.2.58 version. Got the correct tags on AWS console side:
I0207 00:26:32.410.477876663208 MainThread /root/.pex/installed_wheels/502183de0cb11c911983d26ffd0f8af0f0f55ad06ae3d2f4e9c2ce7f94dfa18a/deploy_agent-1.2.58-py3-none-any.whl/deployd/client/client.py:204] Host information is loaded. Host name: helloworlddummyservice-server-test-osoriano-integ-0a01d5a4, IP: 10.1.213.164, host id: i-07a2bddf23a2706af, agent_version=1.2.46-pinterest-1.0.2, autoscaling_group: helloworlddummyservice-server-test-osoriano-integ, availability_zone: us-east-1e, ec2_tags: {"aws:ec2launchtemplate:id": "lt-0e2fc39c66fc4c8a9", "Name": "helloworlddummyservice-server-test-osoriano-integ-0a01d5a4", "aws:autoscaling:groupName": "helloworlddummyservice-server-test-osoriano-integ", "usage_tag": "SRE", "aws:ec2launchtemplate:version": "2", "Autoscaling": "helloworlddummyservice-server-test-osoriano-integ", "service_mapping": "helloworlddummyservice-server-test-osoriano", "testTags": "yaqinli", "availability_zone": "us-east-1e"}, stage_type: None, group: ['CMP', 'helloworlddummyservice-server-test-osoriano-integ', 'envoy-sidecar', 'singer-prod-sidecar', 'tcollector-prod-sidecar', 'mcrouter-prod-sidecar', 'metrics-agent-prod-sidecar', 'zk_update_monitor-prod-sidecar'], account id: 998131032990

We can see the constraint is setup correctly here:

We can confirm that the tag originated from the deployd on the host and not from a CMDB query. This is because the CMDB has not been updated with the new tag yet, given that I had only added it a few minutes ago:

Further evidence for this can be found in the following log record:

I have decided to discard this Pull Request as the 'facter' command does actually retrieve all tags. It's just that the delay seems a bit lengthy because it attempts to gather information every hour.