Hi, I'm making this post as I hadn't seen anything about it in the dev channels or here, and just wanted to be sure that the team is aware of the issue, and the fix.
This played out in #linux, over quite a while, and revolves around Heroic Game Launcher not being able to pass Arguments to the game. Namely the --enable-mods argument.
Initial discovery from what I can tell: #linux message
First bodge fix: #help-and-support message
Actual fix: #linux message
If this is already known, sorry for flagging it again.