I had an uncanny experience like that as a teenager with an “NPC like” character. I was walking around a small cul-de-sac, and there was an older woman standing in front of her house, completely frozen in place, just staring off into the distance blankly.

As I’m walking past she suddenly looked at me and barked out rather aggressively “Do you know what time it is?”

I checked the time on my phone and told her it. She snapped “NO! It’s [completely different time]”

Then she just glared at me in complete silence. I started walking away and she just turned her head, watching me, but not saying another word.

She didn’t move from the spot she was standing on.

That said I blame dementia, psychosis, drugs, or otherwise failing mental health before I’d jump to the nothing is real or everything is a simulation conclusion.