I have the same problem with my Galaxy 22. I think the Samsung August update messed up the audio en screen recording. Now when I do a screen recording of a video call, I cannot hear my voice but only the voice of the other caller. I hope Samsung fixes this problem soon.
The new update S901BXXS2AVHD /S901BOXM2AVHE / S901BXXU2AVHE dated 1st September 2022 has fixed this problem. I updated and now can hear both voices (mine and caller) when I use Screen Recorder.