There were already some regressions, mostly afraid of more. (New code - the format itself will be changed anyway also it will have more automatic tests.) There are not trivial changes in RMG, please look at them.
No such regressions were found. (However due to our architecture loading of old save will break new features until restart as map format depends on handlers state.)
When exactly itâs occur for you? Tried to remove mods?
PS: One problem of editor is that itâs doesnât check if mod enabled or not in launcher and load everything. So itâs crashing when itâs unable to load JSON that âinvalidâ since loading not as permissive as in VCMI.
Maybe itâs not good idea to load all mods including disabled?
After loading all mods editor will generate RMG map with all this stuff, fitting or not?
PS I have few mods disabled most of time, because they break game configs, when enabled with other noncompatible mods. They will surely break editor too:-)