Third party launchers randomly freeze for no reason.
Lemmy app crashed due to unknown reasons, but suspected due to battery manager failure.
Notification of your post never showed up anyway due to Android hosing notifications with Doze, which everyone thought Doze was done for, but really it was just buried deeper into the OS.
And then Google decided to A-B test all Lemmy users, so that the Lemmy app opens random songs in YouTube Music instead.