Finding map of a dungeon on another dungeon's stray fairy didn't show anything on the popup

[GDuroS]

I just found the Snowhead map inside Woodfall temple. It showed the in-game popup for getting fairy, but no text was displayed.

The exact location check and result (from the console) is as below:

(Team #1) Gabriel sent Dungeon Map (Snowhead) to Gabriel (Woodfall Temple Pre-Boss Upper Right Bubble SF)