On my FP4 with A15 (FP4.QREL.15.14.3) I enabled app pinning (Settings/ Security and Privacy/ More security and privacy/ App pinning). When I then pin an app, I cannot then unpin the app.
With 3-button navigation, the instructions say to press and hold the back and overview buttons, but when I do so nothing happens.
When Gesture navigation is enabled, when an app is pinned, the swipe-up gesture (to unpin the app) is ignored.
I can recover only by restarting the phone.
Has anyone else observed this behaviour, in any operating system (e.g. Android, eOS)/ version (e.g. A13, A14, A15) or hardware platform (e.g. FP3, FP4, FP5, FP6) and/ or can share a solution? Thanks!