rendering errors


I don't know what this type of error is called, I'm an amateur video editor, I think it's called artifacts?
Hello, from version 10.6.3 when rendering my videos, I have strange artifacts when rendering, they happen randomly, I tried to close all the applications and leave only the final cut pro open, but I still have the problem, uninstall final cut and restart it install, in the previous version this did not happen to me, I used the same file format (h264) in 1080p, in the timeline everything looks good no problem there, the frame rate is the same 23.98p no problem there either, I don't know what it could be, I'm going crazy, I have to render multiple times until I have a video without so many artifacts, they always happen randomly, I have a macbook pro 16" (m1 pro), I use apple pro res 422 rendering