when entering in the nether in my 1.18 survival world (amazing work done there by the way) i found a bug where when you enter the nether or end it dosen't count toward the adventuring time challenge. Can't/ don't know a way to provide attachments for this bug but if needed i will try my best to comply.
Adventuring Time only applies to overworld biomes. Nether biomes have there own advancement (Hot Topic Tourist) while The End biomes doesn't have one.