If you go through a transparent blocks, for exemple a torch or a sign that sits at eye level, while there is a block above, will the hand turn black. The same thing happens when you pass a door with a block over you.
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If you did not already, please remember to perform a search before creating a ticket to see if your bug hasn't already been reported.
This issue was reported previously as MCPE-8392; comment your experience there!
I was looking for if anyone had reported the problem, but I found nothing similar. So then I reported it :/
Already been reported please research next time to see if it was reported.