[MC-165727] Falling blocks on top of non-full block without block below do not break

The bug

When a falling block (e.g. as sand) falls onto a non-full block (e.g. a slab or soul sand) without a block below it the falling block will keep floating and does not break.

However, if there is a non-replacable block (must not have a collision box) below the non-full block, the falling block will break as expected.

How to reproduce

Place a floating soul sand block
Let a sand block fall on top of it
❌ The sand keeps floating instead of breaking

Linked issues

relates to 2

MC-162560 Falling block switches quickly between entity and block when it fell on the shulker Resolved

MC-165034 Falling blocks convert to blocks when falling on top of a boat Resolved

Attachments

Comments 5

diexd3267 2019-11-16T15:06:12Z

i didnt see any bug report saying this bug

Xeno200 2019-11-16T15:21:40Z

ooo

Jiogo18 2019-11-16T19:21:50Z

Bug of idbox for falling sand and slab (work for non-naturally generated slabs)

If slab has no block bellow (air, water, entity...), the falling block stay as entity when it is on the slab

(and pop after 25s)

Edens Rain 2019-12-22T17:08:59Z

i don't get this.

what does this mean for factions on 1.15.1? like will i need to place torches instead of slabs to stop sand stacking?

marcono1234 2019-12-28T23:17:21Z

@@unknown, no there is nothing special to consider for 1.15 or 1.15.1. This bug has been fixed in 1.15 Pre-release 1, a version which has been released before 1.15.