You cannot drag a crate past an on-wall O2 locker
Or at least not this one, haven't tested others yet. I was trying to drag a crate past it to go outside with it to build my awesome AME, and it wouldn't go onto the tile with the O2 locker. I could not push it onto the tile with the locker, nor pull it.
Not even admins editing density = 0 fixed it. Nor did them using buildmode to try pushing the crate onto the tile. Nor did them using buildmode to try pushing the locker onto the tile with the crate. They ended up just deleting the locker for me after I emptied it onto the ground.
I had Probe1 present and he saw this too.
Wall O2 locker that I had the issue with, 1 tile above and 1 tile to the right of my ghost: