Anyone else using the official Android app and constantly bombarded with "delete_alert" notifications? Google is useless these days, but when I've looked into this before it appears this might be related to the app trying to update or remove a previous notification that is no longer relevant.

I don't recall ever seeing this by itself. There always seems to be another notification, usually updates for HA core or HACS modules.

Example: https://imgur.com/a/UEKZUKg