So yeah, same problem here.
I have tried now 3 times, twice with party member trying to help me in my single player mission and once by myself.
All three times me/we couldn’t interact with the turrets/anvil in the airship, the giants do shoot their projectiles and other enemies attack too, also the airship crew attacks when enemies are lured near them.
But yeah, can’t do anything with the turrets, cogwheel icon is visible but there is no ‘’Press F to interact/use/anything’‘.
Also 2/3 of the runs Caithe had the objective star over her head for the whole mission, on the second run with my party member she didn’t have it, but the mission still bugged at the airship turrets.
Hope we get fix soon D: would like to finish my personal story.