Heya ARon & Jim! Why yes there was a TNG and X-Men crossover. When I was a kid, I read so many TNG and DS9 paperbacks but I couldn’t bring myself to read this one because I thought it was weird. https://en.m.wikipedia.org/wiki/Planet_X_(Star_Trek)Any Trek novel written by Peter David is definitely worth any Trekkie’s time.
Isn't that the same episode that parts of the ship are cut off from each other, and Troi, who holds the rank of Lt., is forced to take command as the highest-ranking officer on the Bridge? She struggles, but of course, does a good job.
A couple of seasons later if when she takes the test and gains the rank of Commander, even mentioning her time in command of the Bridge as part of the reason why she wants to take the test now.
So didn't she always hold a Starfleet rank?