Commander goes full headbang when building underwater

So i was playing a 2vs2 game with a friend of mine against ai, when i construct multiple buildings with my commander everythings fine. but when i give my commander the task to build only one building he suddenly things he's at a heavy metal party and building goes very...very slow. so is this an known bug or?

p.s i will upload a video (if i can) about this bug when it happens again.

Rick

It's not only happen under water, but depends on commander and building position.

I not sure if there task for that because it's pretty hard to reproduce it, but if you find reproduction report it on bugtracker please.