To reproduce:
Board a happy ghast and fly around.
Get off the happy ghast.
Walk around. You will see the POV move similar to how it does when on the happy ghast.
It is expected that the POV movement returns to the sharper walking camera, but it remains as the floaty happy ghast camera.
To reproduce go near anywhere that villagers sleep at night. You will see them walk while lying down as shown in the video clip posted by Damian. ( I tried to upload a screenshot but it always failed.)
To reproduce:
Board a happy ghast and fly around.
Get off the happy ghast.
Walk around. You will see the POV move similar to how it does when on the happy ghast.
It is expected that the POV movement returns to the sharper walking camera, but it remains as the floaty happy ghast camera.