Hello!

A fleet consisting of a battleship, 2 missile boats, 2 nuclear submarines and an aircraft carrier are currently stationed just outside an ongoing defensive siege.
They have been bombarding the enemy settlement (our cities are bordering each other) for a few turns but if I bombard them during turn 400 they will be stuck waiting and never fire their shell. The unit is then stuck in its "animation" stasis not allowing the game to continue. Reloading the save reproduces the same result every time, and it's possible to continue the game without bombarding. I however find it important to at least send this in for possible investigation as it might be an animation bug that shouldn't happen. Once the bombardment is launched it gets stuck in an "ongoing strike" inside the ongoing siege which has not been turned into an assault/sortie.

Preview here of how it looks here. 

I've included a save-file right before the bombardment happens so that it can be de-bugged in real-time: Save Just before breaking.ctr