Usually you have to clear cache to get new bloom arts to work, but someone on the Wikia Discord server mentioned a better way (assuming you're on PC).
Go to Users\[User]\AppData\Local\Google\Chrome\User Data\Default\IndexedDB on your computer and delete the folder called http_dugrqaqinbtcq.cloudfront.net_0.indexeddb.
Keep in mind this deletes the FKG settings that you have saved (i.e sound volume), but it worked for me in getting Rainbow Rose' bloom icon to show.
Speaking of which, I absolutely adore this new art. I always prefer portraits where the girls are smiling .
Unfortunate, still will RG when I get the chance.