HIVE

Neutral aggressive will cause the mouse to turn red. I haven't tried with actual melee AI, just creeps in my RPG and I don't get any desyncs. Of course there is no AI (that I can't control) telling my creeps to attack or whatever. I'm not sure what destroyer form does, it was part of DGUI and I wasn't sure so I kept it. Have you tried it out with AI players?

I have a probability that what's causing the desync are AI players sometimes issue a unit an order to move to dummy unit's location, that's why we can't detect it and it causes desync. This is really bad if it's true, at least for me lol

And what I can notice is the desync usually happened as soon as the AI finished a construction or trained a unit.

Creating for aggressive doesn't work..
Aaaand... destroyer form doesn't fix it.

Wait, what player slot are you using for your creeps? Empty slot? Netural? Computer? Because even only with computer slot without AI script already leads me to desync. Afaik the game unwantedly runs an unknown little AI script automatically for computer slots.

EDIT:
After testing a while, I'd take that last sentence back, it doesn't desync without melee AI script.

My creeps are using NH, but I have dungeon units/bosses which use Computer Player 12. I haven't done thorough testing, but i have tested multiplayer and there were no desyncs (once I fixed a couple).

I see. Then maybe ui systems indeed can't work with melee AI.

Btw, are you using universal kloader to multiplayer test your map? I wonder why local files only enabled for one window only? It used to be enabled to all windows, it only occurred lately. Is it just me?

I think it's happened to me before. But I test with multiple PCs sometimes, or on battle.net.