When I entered the mech smoke spewer raid tile, the map was completely covered by opaque smoke. This prevented me from doing anything about the spewer. I "beat" the encounter with the -5000 hp tool from the dev console. No mods.
Hi,
when you still got a safegame with that issue, could you upload it somewhere and post the link.
I bet the devs would take a look on it.
Alternativ if you can reproduce it, describe it,
THis is the link to the saved game.
https://drive.google.com/drive/folders/1kj1vZGMJi2sJtqn2Si4mXDNNVCumreMQ?usp=sharing
Unfortunately this seems to be a corrupted save. There is no smokespewer quest or location on the map and there are constant red errors. I'm not sure exactly what caused the corruption, but I think that's the reason for the error, not a vanilla bug.
Edit: It seems this save was added to the wrong topic, I will need a save of this smokespewer event issue still, please.