How do I go back?

So for some reason unknown to me I am now getting an error appear when I try to publish my island that states:

Failed


image

All I have done is remove a decal add 2 spawn points and updated the settings to reflect this. That is all. Nothing has changed with the map apart from that to my knowledge anyway. I do not work in a team so nobody else should be able to make changes.

So how do I revert to the approved version of my map in UEFN?

No one knows?
Even admin/mods?