So, if I understand right, the issue is a waller's wall being placed directly on-top (not to the side, not in front of you, but directly on-top) of your hero, thus making them unable to move, period.
Here is some ascii art:
Hero = X
Wall = [===]
Here's the issue in all-caps: WALLS CAN SPAWN DIRECTLY ON-TOP OF YOUR HERO
And TLDR: walls can spawn directly on your hero
Keywords: directly on-top
I don't know what kind of person can't see the problem by now...
lol exactly. It's basically a free Jailer affix (and I think even lasts a little longer than jails).