The bug
When tripwire / string is on top of transparent blocks (such as slime blocks, honey blocks, or stained glass), those transparent blocks do not render properly behind the tripwire.
MC-166346
Transparent blocks do not render properly with tripwire above
Resolved
Fixed
8
Confirmed
Normal
Rendering
1.15 Pre-release 1, 1.15 Pre-Release 2, 1.15, 1.15.1, 1.15.1 Pre-release 1, 1.15.2, 20w07a, 20w09a, 20w22a, 1.16 Pre-release 2
1.16 Pre-release 3
Retrieved
Also applies to honey blocks.