Trial chamber maps don't unlock the "Treasure Hunter" achievement

The Trial Chamber map doesn't unlock the Treasure Hunter achievement.

Steps to reproduce:
1. Create a new world and trade for a Trial Chamber map.
2. Go to the Trial Chamber shown on the map.
3. See if the Treasure Hunter achievement unlocks after a short period.

Observed results:
Treasure hunter achievement is not unlocked even after long periods of time after entering the Trial Chamber shown on the map.

Expected results:
Achievement should have unlocked once entering the Chambers.