Not only the cannon towers, but ballista towers are broken too!

[Handel]

This becomes extremely frustrating! As french my large city WTH ballista towers was attacked by attackers including 2 catapults. I thought "Ok. let them come in the mousetrap..."
ONLY TO FIND OUT THE BALLISTAS DON'T WORK. I could clearly see them so at least as graphics they were there. But they didn't shot a single bolt although the enemy catapults were in range.
Even more - the two stupid catapults were not only in the ballistas range, but in crossbows range. I specially turned off the "fire at will" option of my 2 crossbow units, then hit "stop" and then pointed them to shoot at the catapults. And 120 crossbowmen shot all their ammo killing ONLY 9 from the catapults 12 men crew allowing the catapults to make the wall like swiss cheese. And yes - all the crossbowmen were lined in a single line.

This game becomes increasingly frustrating. Practicaly every aspect in the game is broken and not working as intended.