The cape of a player moves up towards their back when sleeping

The player's cape moves upwards into their bed when sleeping. This is not reporting the cape being in the bed, but the movement which can be seen before it hits a resting point on the player's back.

Steps to Reproduce:

1. Set time to midnight

   /time set midnight

   /time set midnight

2. Place a bed

3. Enter third person

4. Stand to the right of the bed, and sleep

Expected Result:

The cape would stay on the player's back from when they are standing, to when they sleep.

Observed Behavior:

The cape moves upwards to the players back through the bed.

Screenshots/Videos: