Is it possible that older files from 1.16 may have transferred over to your game folder somehow?
Try replacing your materials folder (FeralHeart\media\materials) with this one:
https://drive.google.com/open?id=1ZBFBvfWOlChOO47p1MxnBwXAFaqC4DBz
...Wait I don't see Fmanemat what does it look like/say?
Try going into Feralheart/media/materials and replacing your fmain material file material FtuftMat at the bottom with:
And maybe also replace the material FmaneMat and material FmaneMat2 with:
If this doesn't work then I'm at a loss, but I'll keep wracking my brain for possible solutions.