there’s been threads and individual posts on audio issues in the feedback thread to that extent.
It’s not clear if it’s audio plumbing (call volume, sending, but not receiving voice or the opposite) or operator issues with 2g vs 4g voice calls (the latter not achieveable outside experimental builds).
To me it reads like a newly introduced issue in the audio subsystem.
People should test how their mic input and sound out behaves in messenger calls first, then check mobile network voice calls (2G for current official Samsung /e/OS owners).