This is not a bug. Not sure where this should go instead, but let's not clutter the bug list.
This is a good thing to note, however. I would like to see a consolidated list of the problems with the ADOM message system, as there are numerous issues. Though, in this case, it could be resolved either by not allowing dark rooms to generate in ToEF or by creating a separate message for those rooms when generated there.
EDIT: Apologies, that probably sounded rude. It also stated an opinion that this was not a bug, though it may in fact be considered a bug.