This is a regression. It used to work correctly, but broke at some point.
The bug
Bees and wardens produce particles that are specifically designed to collide with solid blocks. Namely, bees drip nectar that is supposed to despawn when it touches a solid block, and warden digging particles are supposed to behave like normal block particles, landing on the ground.
Neither of these work anymore, instead the particles just ignore the blocks and fall right through.
How to reproduce
1. Make a big glass enclosure
/fill ~ ~ ~ ~10 ~10 ~10 glass hollow2. Spawn a bee with nectar
/summon bee ~ ~ ~ 0 0 collected_nectar3. Spawn a digging warden
/summon warden ~ ~ ~ 0 0 minecraft:spawn_emerging4. Enter spectator mode and observe the particles
Expected behavior
Nectar should disappear on contact with the ground
Digging particles should gather on the ground
Observed behavior
Both particles pass right through the ground
Notes
This is breaking some existing and upcoming marketplace content. I believe it's the same issue as MCPE-167922, but this time with vanilla impact and repro steps.
This is an extremely annoying problem, I have my bees at y: 69, with a basement under them at y: 37, and I see the particles they need to fix this really.