Lighting in some places makes the block on the right side of the screen transparent, when showing the cursor is pointed to an area of the map no case the block, the occurrence in some places, the bug some when there are windows where there may be daylight throughout the premises.
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Thank you for your report!
We're actually already tracking this issue in MC-63020, 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.