A large portion of the Umbraco community has left this platform and using things like mastodon/blue sky instead. Pretty sure 24days and the people who run it have all left this platform.
Do you use PageNotFoundManager for Umbraco on v10-13 and have nested domain bindings?
If so, you may have been experiencing a bug where the wrong 404 page was being show.
A fix for this has now been released
nuget.org/packages/HotChilli…#umbraco#packages#community