Android Prey icon starts Pocketbook reader instead after login

It looks very weird, but if I tap the Prey icon I get the login page, and after entering the (correct) password, Pocketbook reader starts instead of Prey.

If I uninstall the Pocketbook reader, it works fine, but if I reinstall (and reboot) the problem is back.

Prey reports correctly though, and reacts to requests like update location.

Xiaomi Mi A1with Android 9.

Anyone? It cannot be me only…