I had Nova Launcher installed and set as default. Yesterday I updated to Android 11. After the update there's a bit of mixup: mostly when I go back to the home screen, it presents the Nova Launcher as expected, but sometimes it drops me into the preinstalled launcher I stopped using long ago in favor of Nova.

Pressing the home button again pops up the Nova Launcher.

Device: Nokia 5.3 (Android One)

How to properly fix this?