Inability to attack swimming enemies
 

If for example an enemy flees into water (such as the various crocodilians in the Oasis of Marr) I won't be able to hit them with auto-attack shortly after they begin swimming. It says "You cannot see your target".

I'm not sure if this occurs when both opponents are entirely submerged (as would be the case in Kedge Keep, for example), though it makes fighting around water rather frustrating at times.

Does anyone else have trouble with this?

Yeah mobs running into water is extremely jarring, they get into some weird limbo-region between underwater and abovewater, so you hafta find some nanopixel correct Z coordinate to land your swings at em. Bash and such seem to work just fine, but spells and melee tend to cease working.

PCs and NPCs will be able to melee through water geometry, pending update.