This is not much of a bug to care about but its has to do with the top of Acacia Doors.
Three 2x2 holes seem to be missing when the door is closed. However it works like normal when it is open as shown in the first screenshot.
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Thank you for your report! However, this issue has already been reported as MCPE-8868. Consider doing a search next time, to check if a report on the issue you're submitting doesn't already exist.
migrated
Thank you for your report! However, this issue has already been reported as MCPE-8868. Consider doing a search next time, to check if a report on the issue you're submitting doesn't already exist.