Possible main cause of the delay?

My guess is that its these little changes that AGS made to the game that many players didn’t asked for like censoring, NPC skin recoloring (for their sake of diversity), some of the original preset faces that got replaced with their ogre faces and who knows what else AGS made changes to the game compare to the original version Korea / RU has any of these could be the root of issues

Nah, critical issues like those are usually exploits or crashes that can affect the majority of player base