Bells generate in plains_meeting_point_5

The bug

Bells generate in plains_meeting_point_5 normally the bell should not generate in plains_meeting_point_5 according to the structure block.

Also the bell generate with floor blockstate causing the reopening of MC-140940.

How to reproduce

World type: Superflat world
Seed: -7452085687719300672
/execute in minecraft:overworld run tp @s -2449.48 3.94 677.44 -712.05 86.85