(Android) scanForDevices won't "find" a paired device

[RantyDave]

As per subject, my scanForDevices event handler won't pick up a device if it has been paired. Only Android even can pair with it - iOS doesn't even list it as an option.

If the situation is really bad I can change the firmware on the device to make it un-pairable but I don't know how to make it do that either (stop advertising a name?). Besides, some are out with users (and buried in epoxy) so that's not ideal.

I've been pulling source code to bits and can't find anything even casually related. Any ideas?