Thanks, should be fixed in the next build. However for style reasons I would strongly advise you do not use includes in groups!
I shouldn't reply in the closed bug section, so I'll post my question here:
I include all my event sheets in one event sheet, which I point to in my main layout. It provides a good overview, and it seems to be a convenient way to organize and deactivate a collection of event sheets (I use it for instance when presenting certain full screen overlays to the player or running separate minigames).
Would a recommended way be, to encapsulate every event sheet in a group, and then for instance deactivate a selected part of them, in a function call?