The side texture of the leaf block will disappear when an enchantment table / day/night light sensor are placed on the side of the leaf. See attachments.
I did a research using word "leaves; daylight sensor" if this ticket is a duplicate, I am sorry.
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This bug report duplicates MCPE-12975. Please perform a search next time to make sure your issue hasn't already been reported.
This bug report duplicates MCPE-12975. Please perform a search next time to make sure your issue hasn't already been reported.