The stronghold generation in my survival world was anomalous for a multitude of reasons. Firstly, it was generated inside a trial chamber, which I have personally never seen before, resulting in floating iron doors. Secondly, all this was somehow generated in a lush cave, resulting in glowberry growths on the ceiling and floating vines. And as if that wasn't strange enough, the stronghold was also generated inside an abandoned mineshaft and a dungeon, all of which conspired to make for a laborious search for the portal room.
Nevertheless, a fun phenomenon to encounter!
by Jawa_was_here