I haven't tried it on the Forma, but I can definitely confirm that it's pulling stuff from hidden folders on my H2O
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It actually did it in a fairly strange way (I'm assuming because of the terrible I/O perf of the H2O, and the massive amount of crap I happen to have on my H2O behind dot folders ^^): instead of picking it up in the usual "Importing content" screen after an unplug, the screen showed up almost a minute later, while I was browsing the Library...
Sidebar: While I can understand showing the path, opting for an absolute path (custom Linux mountpoints and all) seems a bit of a weird decision? Probably ought to be relative to /mnt/onboard or /mn/sd, with something else (an icon?) used to differentiate internal from external storage...