What I expected to happen was...:
Farmlands and Honey block have the same idbox
What actually happened was...:
items/entities/players (hand) on honey block are dark (but visible, unlike MC-165298)
Steps to Reproduce:
place a honey block and an another block (farmland if you want)
drop items / summon entities / go on this block
This is likely caused by the same rendering issues that causes all entities to become dark when intersecting solid geometry.