Falling Gravel (+ Others) Disappear When They Fall on Cobweb block

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.