Automount/External hd issue

Evening. Ive encountered a strange issue with my external hd. Im using a mini pc. Got a bazzite image on an ssd formatted to btrfs.

Lots of games installed on an external (powered by plug) hd. Also formatted to btrfs.

When I turn on the mini pc (hd is always on) this auto boots into bazzite gaming mode. All games on the hd show as not installed. When I look in storage via gaming mode. The hd shows.

If I exit to desktop mode. Then return back to gaming mode. The games show as installed. My feeling is that on boot the drive is not automounting straight away and therefore bazzite doesn't load the games.

Is there a way I can check/fix this?
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