Aslong as you don't pull the boss or whatever enemy alone when you get back into the game while the rest still watch the cutscene you should be fine, atleast if I had someone with internet issues in the group. I also hope that GMs would be kind on you if they see that you don't pull. maybe say in chat "sorry i dc'd, I'll wait for the rest of you to get out so please don't report me" or something explaining your situation