passed through the Recycler and your current position
That's where I'd go "uh, no." Hostil bots shouldn't be allowed to "step over" you like that. Step over allies? Sure, fine, not a problem, totally get it. Step through
your space? Absolutely not.
D&D has a thing called "attacks of opportunity" when enemies try to maneuver around you too much, for precisely the reason that if that rule didn't exist, you could easily flank someone (and get the associated bonuses).
The "doors aren't bottlenecks" solution you say would make things deadlier is true, but that's also what's actually happening here. If Cogmind had been in the doorway and the recycler one step out, then that grunt flowed around Cogmind, just as in your alternate scenario.
IMO that grunt should have stopped on the pile of matter just inside the door.