When choosing the update option on the texture pack nothing happens and when scrolling down the ratings aren't shown. I own the Steven Universe mash-up pack but I'm not sure if it affects others.
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Can you explain why my settings and player model when I add a texture pack

Thank you for your report!
However, this issue is a Duplicate of MCPE-57377.
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Can confirm this. None of the items that show as needing update (3 texture packs and one world template in my case) can be updated. Clicking update button doesn't do anything.