Broken Formations and AI Stuck Circling

[Strait Raider]

To replicate broken formation problem: Launch Old vs New Destroyers with 4 destroyers. Detach the destroyers into individuals, then select them all and have them join the same group.

The group icon disappears from the bottom of the screen and ships can no longer be detached.

The second issue is ships seem to be somewhat frequently getting stuck in a constant turn in one spot, regardless of orders given to the ship. If the ship is a formation leader, the entire formation will break down as a result. Otherwise, the ship just gets left behind. Attempting to manually override the rudder does not fix. The ships are not on AI control and are undamaged. The ships will change course temporarily if they detect they will collide with friendly ships, but otherwise seem to be stuck this way until the end of the battle.