When gravel falls onto a cobweb, it slowly falls through, and then disappears, rather than dropping as a collectible item.
Small video clip attached, showing how gravels falls and drops as item on torch, but not on cobweb. (low quality, but should suffice)
Also affects:
Red Sand
Anvil
Sand
Top Snow
Possibly related to MCPE-1682 , but that was such an old bug and didn't mention Cobwebs.
Edit: Added animated gif to view without download. Added affected blocks that fall.
Linked issues
is duplicated by 4
relates to 3
Attachments
Comments 6
Gravel, sand, etc. only sense for blocks to be in the way, not torches, cobweb, etc. If they don't find a valid block under it, they'll despawn and change to an item sprite.
Confirmed on iPhone 6+ (iOS 9.2), 0.11.0 through 0.13.1. Falling sand despawns after four seconds, and so this can also be observed during its uninterrupted falls.
Confirmed, the falling sand will disappear because there is no space to place the sand from falling sand to the regular block.