Summary:
Items and hand move when you start/end running with RTX enabled when view bobbing is turned off. With RTX off, when view bobbing is turned off hands and items are always in the same place (and according to MCPE-94867, this is the intended behavior).

Steps to reproduce:

1. Turn off view bobbing.
2. Turn on RTX.
3. Run (Ctrl+W or W twice).

Observed results:
The hand and item move.

Expected results:
With view bobbing turned off, the hand and item should not move.