We have encountered this problem some times but were now able to do a screen-grab of that:
We have made some text corrections in a document. We usually work with the display set to "normal quality". But somehow those corrections were gone. Just by chance we changed the display setting to "high quality". Having changed that setting the corrections suddenly had shown right.
Before making the attached video we had corrected the word "Colours" into "Colors". In the video you can see that this is only shown right after changing the display setting. When we save that file, restart InDesign, everything is fine also in normal quality mode.
Once again I guess it is some kind of caching problem.

Apple M1
MacOS 14.8.3
InDesign 21.2