If you open the dungeon selection dropdown while viewing a dungeon where you can go to a different floor and change floor by clicking the door icon, the dropdown will go blank.

Closing the dropdown and opening it again after makes the text in the dropdown re-appear.

Reproducible steps:

1. Open Shrine of the Storm (on the "Shrine of the Storm" floor)
2. Click the dungeon selection dropdown
3. Click the door with an arrow icon to change floor to "Storm's End"