Well I could send you the project for you to check it out closely and get the guessing out of the way so you can accurately pin point what’s going on and what can I do to fix the problem if you are willing to. Also, tried that (disabling the Mikkk Tangent Space option) and it didn’t work Xd.
I don’t know if it is possible or there is a problem with that to be honest but if it is possible and you’re willing to check it out, I can send you the project, just let me know.