Just to be clear, on the third point- do you mean Co-op VS AI? Or quickmatch/other full matchmaking modes?
I play primarily VS AI, except for brawls for the chest/for fun. I play Co-op vs ai solo about 40% of the time. Occasionally we’ll start a party from those randomly matched people, as the games go on, or a friend will come online and join. Call that another 20% Coop vs AI in a party. No apparent limitation or set rotation of the maps there.
I play VS AI Teammates solo if i need the ability to hit escape and pause, or so it won’t upset anyone if I alt-tab for a moment. Majority of these games recently have been to test that this problem still affects me.
As for playing primarily with the same person, my mom plays HOTS too, and when I’m partied with her we only play with AI teammates. She has the same map pool as I do whether we’re playing together or not. She also has had the problem since it first started- pointing it out to me during the toys event i think. When the anduin patch hit, to help disprove we were affecting each others’ map pools, we played AI Teammates separately. We each got the same 4 map rotation. In the past we’ve branched out to playing Co-op, to test the map rotation problem, and we could get maps outside of our pool.
Let me know if I can clarify any of these points further, or if you believe I fall under one of those three categories you listed. Thanks!
edit for future reference: Just knocked through a bunch of Co-op vs AI. BHB > Cursed Hollow > Hanamura > Garden Terror > Braxis > Towers > BHB > BoE > Volskaya > Sky Temple > Warhead > Braxis > Garden > BHB > Volskaya > Sky Temple > Hanamura > Towers > Braxis. Got 10 out of 13? possible maps across 19 games, only ones missing were spiders, dragonshire, and alterac, which could easily be due to sample size.
Day later edit: Switched back to 1v9 with AI teammates. Volskaya > BHB > Sky Temple > Hanamura > Volskaya > BHB > Sky Temple > Hanamura.