Subspace Bubble Advancement is granted when entering the same portal in and out

I managed to reproduce it while experimenting with portals. I have no idea how this happened lol

Actually it turns out my reproduction requires a different bug to exist, so it might be not this bug

@Mine Dash123 can you please give the seed of the world in which the bug happens?

Or did you revoke the advancement prior having the bug?

I have recreated this glitch in 20w29a, apparently it happens when you enter your first Nether portal of the world and it is far enough from spawn. It seems to only be working on the snapshot, though.