According to my experience, there's no problem in using 226f as an editor platform as long as you make sure to run WingedUnicorn's LevelSummary batch converter tool thingy on your maps before release to make them compatible with pre-226 versions of Unreal.
That's what I've been saying the entire time.
Also, i'm not interrogating you Kew, i'm trying to get your user base the best possible experience, you probably don't know how much Illhaven was spammed in the coop community for years
, which is why I asked if the new version will have any quick coop tests to make sure nothing is going to break and stop players from finishing the map based on movers with people either blocking them or respawning after doing certain things.
I don't want people to edit the map post-release to fix it if it can't be fixed with a mutator. Creating version mismatches is really, really bad for things like this.