This might be a clone of MC-161896, though I'm not entirely sure.

The bug

I was messing around with honey blocks making items fall slower when a honey block item fell through the honey block and caused a visual glitch. It appears the outer cube of the honey blocks cancel out allowing you to see through them like there is only one layer there.

Steps to reproduce

1. Place a honey block
2. Throw a honey block in front of the placed honey block

-->  See visual glitch