OS Name: Microsoft Windows 7 Home Premium
System Type: x64-based PC
I was testing an empty map with some item frames hanging over Staircases, and then I noticed the borders of the item frames were turning invisible, and it became visually annoying to me, so I decided to post here. I have attached Images of the Issue below.
To Recreate:
Place Upsidedown Stairs and Get a Map (preferably empty)
Place it on the item frame.
Move your camera angle around the frame.
Can confirm that this was an issue in 1.14.4, however it has been fixed in 1.16.1 or earlier.