OK downloaded the sample file to see if I could find the root of the problem which seems to be a problem with the camera class
By switching to the default PIE camera and cinematic camera the problem goes away as well as deleting the Cam bp class problem solved so there is a problem with the camera.
Looking at the BP the class still uses the legacy camera which is no longer used and replaced with the cinematic cam.
Understandable that it’s broken in 4.19 and above as that is about the time the basic camera was replaced with the cinematic camera.
With out spending time to fix it you could try replacing the legacy camera with a cinematic version