Hi! this issue should be fully resolved now, this was fixed by an update I did last week. Let me know if it works for you!
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I made a new update yesterday. Here is my theory, my unity models have morphs that allow characters proportions to be changed. However most of these are not in use yet, the face sometimes has up to 300 morphs where mobile can only really render about 60 before it gives up. I pruned down the morphs for mobile, if you dont mind let me know if it works for you! please and thanks :)