This is the same issue as MCPE-180267 in which item's that are dropped (from various sources) will slightly jitter midair, leading to a parity issue, as this behavior is not observable in Java Edition.

Steps to reproduce:

1. Place down a vault and open it
2. Repeat the process on Java Edition
3. Compare the animations between both editions

Observed results:
Items ejected from these blocks will jitter midair, unlike in Java Edition.

Expected results:
Items ejected from these blocks should have a smooth animation when dropped, like in Java Edition

Original description:
Whenever items are emitted from such blocks, they always jitter in the air before falling.