I'm pretty sure others will have mentioned this as an issue, but adding in something that just happened as a new data point or two. There's an underwater cave in the SW area of Ocean biome in genesis. We've had a couple of tames instantly die there, as well as one player death and one sleeping player death, all instant.
What is a new data point though, I think, is that just now I was trying to tranquilize an X-mosa in the pool that's in the middle of the cave. I was standing on shore, it was in water. I was monitoring it's torpor using HLNA info, so it was at around 9-10k of 12k torpor wi