Just detected this issue. When you want to delete an event it throws the error "An unknown error ocurred" and keep asking "Are you sure you want to delete this notice?"
Log show this:
[matriu.cat:2648.294d35ac POST /notice/13382/delete] HTTPClient: HTTP POST https://khp.ignorelist.com/inbox.json - 400 Bad Request
So is because khp.ignorelist.com does not have that endpoint.
I'd say this is already fixed with the last updates. I've just deleted two notices, no problem at all.