Yes, that's the only way to ensure people don't end up with the hidden scenario options enabled, for now. Very nice, thanks for testing. Yeah, the problem is the 1 pop city. These "buggy event" messages are shown when an event triggers, but no event options are available. In this case, the "remove 1 pop" option is unavailable because the city has only 1 pop, and the other options are unavailable for different reasons. Vanilla FfH (and MNAI, for that matter) simply let the event fizzle in this case. This makes it harder to find bugs and takes away the event slot, so I opted to show this message instead. You are referring to unique feature visibility, right?