Lately with my workplace it’s been:

Deliverables Team: “Well here’s the deadline we set, so regardless of whatever happens, you need to have all of your work submitted by then.”

Design Team: “Yeah, we’ll get you our markups, but all in big clumps of work, most of it just says before the deadline, but a lot of it we aren’t even going to try to get to you until after that deadline.”

Me: “Okay well then you two need to discuss that because those two timelines are obviously incompatible.”

Them: “Yeah, no. We’re not going to work that out.”

Deadline arrives…

Deliverables Team: “OMG! Why isn’t this done?!”

Me: “Because I don’t even have the design yet!”

Deliverables: “OMG you’re going to make us miss the deadline! Why didn’t you say anything before?!”

Me: First off, this is just a random internal deadline you set. There’s zero real effect of not meeting it. Second, it’s not me making us miss it; I can’t model and draw what I haven’t received the design for. Third, I did say something before, several times in fact."

Deliverables: “Well you need to talk to your design team and make them hurry.”

Me: I can’t and won’t attempt to do that. But I’ll let them know you’re wound up over it.

Lets design team know that deliverables is bent out of shape over missing their made up deadline.

Half of Design Team: Yeah lol they’ll get over it, and if they don’t, they’re only freaking out on you, so we don’t care.

Other Half of Design Team: OMG you missed the deadline?! How could you?!

Me: Well it’s because you guys haven’t gotten me any designs yet.

Design Team: Yeah we’re still working on it and we don’t have a timeline on when we are going to get it to you…but when will you have it done?