Mesa 23.3.3 was included in Jan 13 Stable update. I don’t know when was published in Unstable updates. Reading Mesa forum there are a few complaints about things like garbage output, acceleration problems, problems with images, weird color boxes on screen, etc, with 23.3.x versions. They have already published 23.3.4 with bug fixes and I read some people telling 24.0 solved their graphic issues.
Edit: I’ve seen Mesa 23.3.4 is included in Manjaro Jan 25 Testing Update: