White window and border when using Android split screen

When using the Android split screen (Android task manager -> Press and hold the app's icon -> select "Split screen") then apps show the following errors:

• Completely white background until the split screen is resized and/or the device is rotated (sometimes multiple rotations/resize operations are required).
• Right and bottom white borders (~5mm) after rotating the device.
• The app's split screen size is wrong. This can be "fixed" by resizing the split window multiple times until all controls are visible.

I can reproduce the problem on a Google Pixel 6 Pro, but I got a lot of complaints from Samsung users as well.