If Minecraft Bedrock uses OpenGL ES, jungle leaves will appear closed even if the graphics are fancy! but if using DirectX etc. the leaves become transparent!
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Thank you for your report!
We're tracking this issue in MCPE-16505, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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