I am receiving some iMessages on my Apple Watch that never appear on my iPhone

1. Sent a message to a person
2. They responded.
3. My Apple Watch reported the message received.
4. The Apple Watch Messages App shows the message
5. My iPhone does not

This has now happened with at least three other people. But the majority of messages are handled correctly. No issues.

However my iPhone needs to be the single source of truth insofar as my messaging platform. The Watch is not an alternative to that requirement.

i’ve already been on the phone with Support and we still have not found the root issue.