Have you ever had a boss glitch? Or other unexpected glitches?

Ive been revisiting elden ring and have been keeping my summon sign up helping people.

I helped 5 people get through Malenia today when i had an interesting one... we beat the first phase, skipped cut scene, but instead of going up for her scarlet bloom....she didn't. I look at the health bar and she's got no health left. Before i could do anything she got attacked and died for good. It was bizarre. Hopefully the host didn't mind they got robbed of the 2nd phase lol.

So how about you-- any boss fights that glitched unexpectedly? Or non-boss fights? I know there are glitches people intentionally exploit for speed runs and skips so this isn't about those unless you happened to find them unexpectedly.