Hello
with Studio 19 and 20, the coding used by the software was the MVC, (multiview). This coding allowed 2D compatibility of 3D files on Blu ray. This coding was also used by Sony camcorders. For one reason license payment, Corel dropped this encoding.
The solution is to recode your files in side by side 100% to be able to use them with Studio 22 and following. For my Sony TD10 camcorder, I use the MVC / Side by side DVDFab 11 converter.
cordially