I came up with an imperfect hacky workaround... I set up the whitelisting code to capture the MAC address of the most recently rejected connection attempt, and then I set a watch for a medium-length button press that whitelists that captured MAC. So whenever my phone ends up with a different MAC, and the connection is rejected, I can tell the puck to accept it and then try again.
But obviously, if there's any way I can revert to how the puck was behaving a couple of days ago, that would be infinitely more preferable.
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