The Bug:
Walls below honey blocks don't become tall, unlike walls below slime blocks.
Walls below slime blocks become tall so that they touch the slime block. 26.4 Snapshot 4 made the bottom of honey blocks support the same blocks as the bottom of slime blocks (MC-251041). However, walls below honey blocks keep their low sides and raise their post, leaving a gap between the wall and the honey block, therefore introducing an inconsistency.
Steps to Reproduce:
Place down three walls in a straight line.
Place a honey block on top of the middle wall.
Observe if the sides of the middle wall become tall and touch the honey block.
Observed Behavior:
The walls below honey blocks don't become tall.
Expected Behavior:
The walls below honey blocks would become tall, maintaining consistency with slime blocks.