I experience the same thing. I tried watching one of the TR MTB videos while riding and it was just way too much movement. I expect that is partially dependent on the size of screen, how far away it is and how much movement there is. It is not so bad for me with road race / crit videos, but I probably won’t do another MTB video on the trainer. I didn’t see any jumps or drops, that would probably be way too much for me. Lol
I’ve have also had it happen in certain situations with Zwift. I have a big TV and it is close and fills my field of vision, which makes things nice and immersive, except for when it is too immersive. 