Are there? Yours is the only one I’ve seen. Other clients strip the “_@“ for display so they look the same unless you look at the raw json.
I only noticed this because nostrudel clearly marks your nip05 in particular as invalid next to your name on every note, then I confirmed on several other clients.
For the record I agree with you that this SHOULD be a reasonable way to enter the root domain for nip05. But that is NOT what the NIP says so it would need clarification to bring this into spec.