Hello,
our squad experienced the same thing two times in a row:
We started 'The Lone Story' (normal game, not steelpath), did all the stages up to the Oroworm. After shooting the three rings the first time, the game freezes for about 10 seconds for all players, except the host and everybody gets a host migration (except the host self). Getting back into the arena, one can kill the spawning enemies from the second Oroworm stage, but there is no Oroworm health bar anymore and no enemy counter, indicating the game progress. After killing all the enemies, nothing else happens. The worm is coiling around the arena, no health bar, no shootable targets (rings). Only thing to do is extracting and I think no resources where transfered to my inventory. None of us seemed to have internet connection issues at the time as we where talking the whole time in discord.
I dont know if it has something to do with what ever happend, the second time I just casted Nekros "Shadows Of The Dead" at the time, that happend and it might be the same thing i did on the first run.