During assassination missions I like to knock the target out and carry them to the fixer's car trunk. Especially on missions where there's a second wave of attackers that show up it just adds a bit more difficulty and fun for me.
There's one gig, however, that takes place on the upper floor of an apartment building. When you knock out the target, it triggers the message from the fixer saying the car is ready.
BUT! You actually can't take a body on an elevator. You can open doors, but for some reason you can't operate an elevator while carrying a body. And if you put them down, they fall through the floor, and presumably to their death, lol.
So out of other options, I dropped the guy out a window. Which of course killed him. And when I exited the building he was on the sidewalk.
The elevator part is the bug, but the whole scenario made me laugh out loud.
I expected it to happen on another mission with a similar setup, but for that one an AV showed up on the roof and you literally dump the person into a flying dumpster. So I think they're aware of the elevator thing, haha.
Another time I was sniping an assault in progress from an upper floor, and at the EXACT perfect moment when I shot a pedestrian walked in front of my scope. The part that makes it a bug is they were walking on air. Dude really wanted to end it all at that point, so IMO it shouldn't trigger a police warrant, but it did and I had to run away.