Subspace bubble advancement granted when teleporting player from nether to a distant overworld location

If a player is in the nether, and is then teleported to a distant overworld location, they are granted the Subspace bubble advancement, despite not having gone through a nether portal.

 

I discovered this when testing my map which respawns the player to somewhere random on death. This occurred when they had respawned in the nether due to using a respawn anchor.