Both trapdoors or doors is slightly smaller than three pixels on their thin side.
It's easiest to see this when the block above or below is very noisy (such as dirt) as seen in the second photo.
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[Mod] EVGENSYPERPRO
Graylen_MYT25
Thank you for your report!
We're tracking this issue in MCPE-19214, so this ticket is being resolved and linked as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.
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