The motion of item entities is choppy and jittery under certain circumstances

The Bug:

The motion of item entities is choppy and jittery under certain circumstances.

Steps to Reproduce:

1. Throw an item into some flowing water and watch closely as it is pushed.

Observed Behavior:

The motion of item entities is choppy and jittery.

Expected Behavior:

The motion of item entities would not be choppy and jittery.