I completed the quest where you help out the two monks. Apparently you get a different dialogue if you use non-lethal take downs. But the first time I tried it I did use non-lethal take downs but the monks still complained about me committing murder (odd, since he didn't actually see most of them). The only thing I could think of was that I'd dumped the guy at the entrance into a bin. So I reloaded and redid the mission, this time without hiding the body. The monk then thanked me for not killing anyone. So apparently the game thinks hiding the body = killing?

This mission is so annoying!

Dumping bodies is killing, using blunt weapons (which specifically states "non-lethal") is killing, shooting someone in the foot is killing (because they bleed out or something, I have no idea), using a sledge is killing because it literally takes their head off, and punching them is killing because my Body stat was too high this time and I couldn't just gently slap them.

Only way I have found that is 100 % non-lethal is sneaking up on them from hehind and do a non-lethal takedown. Which is not possible without Netrunner cyberware and the ability to distract enemies.

As you say, how the F would the damn monk know anyway, if he didn't see us killing them.

I wanted so badly to shoot the monk in the end for being so damn obnoxious, but of course the game doesn't allow to do that.
Maybe next time, I should just cozy up to the Maelstrom members and watch...wait, I forgot - the game doesn't allow doing that either. >-<

I did manage to take out the enemy out front via hidden dragon (?), basically dropping from above for a KO. The next two inside were looking away so I was able to sneak up on them and take them out. The two out the back - only one actually moves so you can distract him via a microwave or just wait until both were out back and sneak up on them.

I've seen it go both ways. On some missions, I've hidden droves of KO'd guards in dumpsters and the "don't kill" flag didn't trip. On others, it seems, I'd look at someone the wrong way and it would.

There's definitely some bugginess going on, but you can always work around it...

This game is just finicky sometimes period.

QFT!
(Quoted For Truth)

If a game had a bug that happened every time, regardless, then sure. It would be annoying, but there would quickly be a functioning workaround until the issue was properly patched by the developers.

But when bugs or glitches seemingly happens randomly, and for no apparent reason, it becomes irritating. And that quickly makes a game less fun to play, because there is no telling when an issue will occur, or how or even if it can be fixed.

Fortunately, the vast majority of issues have been ironed out at this point. With regard to "Trevor's Last Ride" as a specific example, I suspect it's a matter of the multiple layers of physics that's involved in the location of the body.

And since CP77's physics has been laughable since day 1, and won't ever be fixed without a whole new physics engine, some issues are bound to occur on occasion.

I think that's why they went with unreal engine for future projects, fwiw.

Using blunt weapons definitively counts as non lethal. I've dealt with cyberpsychos with a club and they were counted as alive. As for non lethal approach you also have eye mod for smart guns, mod for firearms that deal non lethal damage and two hacks.
I think the mission requies to be unnoticed.

You have to be careful what exactly the mission giver is asking from you. There are different levels of non-violent in this game. For example to get the best result from the Militech refugees camp where you need to do an extraction you need to ghost it and fully sneak and even non-lethal takedowns will not give you the best result. There are a couple of missions like that. Also you have to be careful with environmental interactions, i'll give another example with the corpo agent that has gone cyberpsycho in the electrified field. In order to safely take her down you'll need to either disable the electric generator first or pull her out of the water area so she doesn't get electrified as you knock her down. Most people don't bother to read what the quest giver is asking for or don't fully understand the game mechanics so we have people like you failing missions and not understanding why. You can kill with blunt weapons if you keep hitting the enemy after they've been knocked out, also you should avoid headshotting people with the power hammer since you can explode their heads with the overdamage(blunt weapons are non-lethal but only to a point). Best way is to experiment with the different quickhacks, weapons and grenades till you get the handle of it, this is what i did. The important info is generally given to you by the questgiver. The mission objectives on the side do not fully explain how you should approach some missions. The objective can be telling you to be non-lethal but the questgiver has actually asked for non-violent and taking someone in a chokehold or bashing their head till they pass out does not count as non violent.

...That Militech mission is a bi**h! I've found 2 ways to do that one: using quickhacking and Contagion to take down everyone non-lethally. Or clearing the area with a sniper rifle when the mission is available, but without getting close enough to actually trigger it (same methods can be used with the "Trevor's Last Ride" mission). You're talking about Lt. Mower in Kabuki? Where she's dancing around on an electrified field of water?

I've taken her down non-lethally every time, on Very High difficulty, but I didn't know there were any generators that could be shut down. The electricity has never done any damage that I've seen.

Only thing I am aware of, with all of the Cyberpsycho missions, is to message Regina ASAP in case some damage over time ability will slowly kill them even after having taken them down (it has happened more than once...).