Hey Kid I appreciate your effort to help. Just as background information, I'm one of those dudes who watch YouTube videos from all of the good HUT players to get tips on which strategies to use, etc. I've watched Sleeveless' (or whatever his name is) videos about strategies, Eki's, etc. so I feel like I'm pretty well-versed in how each of the game's strategies works with an AI team in 1v1 modes.
I say all of that to say this: this issue is seemingly completely independent of how you have your neutral zone forecheck settings set. I typically have my neutral zone forecheck set to 1-2-2 red and the bias set to hang back as opposed to push forward. My guess is that it's a logic issue with AI defensemen in which they respond to a cross-ice stretch pass by wanting to step up to hit the receiver. This doesn't affect HUMAN players (like that BIGRITCH guy was saying in that other thread), only AI. I should also mention that this "step up" isn't happening at the opposing team's blueline but rather YOUR OWN blueline (which makes it even stranger).
I think I have some clips saved so I'll try to upload them when I get home.
Obviously, this issue can be mitigated by preemptively switching to the far-side D-man BEFORE the pass is made but that can open up a whole other can of worms for you defensively.