Grand Mirror in Delirium doesn't allow selecting any map despite "Select 1 map" pop up

Interracting with Grand Mirror in Delirium opens the atlas with "Select 1 map" pop up, but it doesn't allow selecting any map, despite attempting to click on any of the maps, both with the delirium mark and without.

According to the Delirium introduction it should be possible and should result in covering multiple maps in fog, yet it's not possible.

Please take a look into that.