How to reproduce:
Put item on a block that is on the ground.
Stand on the ground next to the block.
Result: On the way towards the player's feet, the item goes through the block.
Note: This bug could also occur if MC-48577 was fixed, the way to reproduce it would just be different.
This might be working as intended or "won't fix", but I created a report so that there can be an official answer to if it is.
Linked issues
Comments

Resolving as duplicate of MC-69762, which is WAI (though not dev-WAI).
Confirmed for 1.13.1.