I controlled a Jenova, Ancient Calamity and The Regalia that had been crewed. At the beginning of my combat step, Jenova triggered. In response, my opponent cast Stuck in Summoners Sanctum targeting The Regalia. It resolved, then Jenova's trigger resolved.

I now control a still-crewed (and still a creature until end-of-turn) The Regalia that has become a mutant due to Jenova's trigger resolving.

In my second main phase, I cast Sephiroth's Intervention on my own The Regalia.

Expected results: Jenova's card draw trigger goes on the stack

Actual results: nothing happened, Jenova did not trigger