Thanks for letting this known. I see the same here.
While the command show configuration no-encrypt does give you the radius key as well, and the obfuscation is more to prevent passwords/keys from accidentally appearing in command output; I would like you to ask to open a TAC case for this issue and send me the ticket/case number in a personal message so I can follow up internally. If you can't open a TAC case, please also send me a personal message.