Still issue persist since 2 month
I've just checked this on 3.12.4 on Steam and cannot manage to reproduce the issue. I suspect that saves made before the fix was implemented (in 3.12.3, released on 2024-05-30) may continue to have this bug affecting species that were uplifted in that save game, but species uplifted after the fix should be fine.
If you can reproduce the issue in 3.12.4, please let us know!