As I alluded to above, there were significant changes to the Hue integration in platform version 2.4.0, which you can also see in the release notes. Those are undoubtedly responsible for the differences, and it coincides with your timeline, as 2.4.0 was released in December of 2024. I'm not sure what specific difference would have caused this, but clearly, they're doing something at least a bit different from the Hue Bridge.
Is all logging enabled for the app and Bridge device (if it is even created yet, which it looks like it is)? It's possible there will be more clues there.
What do you see if you look at the output of http://<tasmotaBridgeIP>/api/0/config in a web browser (or really anything that can fetch the JSON this endpoint should return with an HTTP GET)?
