When selecting maps in the Training Mode, your bookmarked maps do not appear in ascending order when filter by bookmarks. It appears that alphabetical order is prioritized over at least the bookmark filter. I haven’t been able to test any other filter setting due to limitations with available content in the flight.
Submit it as a ticket on Insider Support if it’s a clear bug/error. They can look into it and make sure it’s polished up for the final agen and everything set to work as intended.
Could get lost in the noise on here.