When banners are placed on the ground in any direction and you look at them at a downward angle, the stick holding them up goes transparent.
Recreate:
Place a banner on the ground.
Back up and keep looking further towards the ground until it goes transparent.
Thank you for your report!
We're actually already tracking this issue in MC-161831, so I resolved and linked this ticket 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 in the future to see if the issue has already been reported.
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