I checked adafruit/Adafruit_Learning_System_Guides#3095 and it appears to have been merged "two days ago" (8/2/25) and the latest release of Fruit Jam OS (1.0.1) says it came out yesterday (8/3/25) however the new minesweeper icon isn't in the release files.
I manually used the build.py to build the files from github and the icon is there.