Ok, I'm giving this a shot in Unity 2022 and I still can't seem to replicate it... Is your text box using Unity UI or not? I did notice that resizing the rectTransform for UI text can cause a redraw if "rememberReadPosition" is unchecked, could anything be resizing that box for you as the camera moves...?
Viewing post in Outline glitching / Text redraw every time the camera moves
All good! I'm still unfortunately not able to reproduce this...
Could I get a screenshot of your inspector for the reading text? The one you shared was just for the outline, I'd like to see your settings on the reading one.
Additionally, would it be possible for you to set up a test event for me? I've got an "OnRebuildEvent" under the "Events" tab, and if you could make that call a debug and then show me the entire debug message, that would tell me exactly the cause of the redraw!