My LG V35 was recently upgraded to Android 9 and after the upgrade app pinning stopped working. I can pin an app but it gets unpinned by the OS and removed from the list of my recent apps. This was never a problem with Android 8 before the update. Any app I pinned before the upgrade stayed permanently pinned even after restarting.
I tried adding apps I want to stay pinned to the list of power saving exclusions but that did not help.
Any ideas how to fix this or is this "normal" OS behavior with Pie?
Edit: This question is not about screen pinning, it is about app pinning (the little pin shown on the app title bar when app list is open).