I have a video example of this as well.
https://1drv.ms/v/s!Asny71-AvMEakWXK94_WfrJ5EjQC?e=XDA0ip
I use the logitech remote and nothing has changed on that end. You can see in the video towards the end that the timeline is actually trying to hide repeatetly, but does not until I push the down button.
I have submitted several diagnostic logs of the timeline not hiding and app crashing when trying to switch pip screens.