Please see the attached images. When I edit a scene and do some masking to hide lights in the background, it looks fine. (First image). When I export it, the masking shows up in multiple scenes and the blacks are crushed. I have included my sequence setting and my export settings. I am trying to export to Blu-ray. I have tried exporting with and without GPU/Hardware and Max Quality on and off. I have also deleted the temp and peak files. Copy and pasted to a new Project. I updated to Premiere 2021 but had this issue and otheres. I am currently using 2020 with all of the current Adobe updates including Windows and video card drivers (NVIDIA GeForce RTX 2070 SUPER). Please let me know if there is something else I can try.