As I play with the Festive Mash-up 2016 texture on, some blocks and items are invisible. They are physically present and can be interacted with but they cannot be seen. Such invisible things include doors, certain types of tree leaves, candles, anvils and crops.
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⚠️ Issues that concern Minecraft (bedrock codebase) should be posted on the Minecraft (Bedrock codebase) tracker. I've moved your ticket to the correct project.
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However, this issue is a Duplicate of MCPE-39648.
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