Wow! I did super deep diving with a blank project and comparing and I cracked it.
I just needed to make a new Media Player, Video Texture, and Media Stream Source assets. This project has been updated several times over the years. And maybe the assets broke or deteriorated in some way.
Literally same exact Media Player/Video Texture/Media Stream Source settings recreated as new assets fixed this problem for me.
Thank God! Whoop Whoop!