Clearing TPM does not ask for new password, but "change owner password" asks for the old one

I recently cleared my TPM (Dell e7240, Windows 10). During the process, at no point did Bios or Windows ask for a new TPM password. (And at no point since I bought this laptop did I ever set a TPM password, to the best of my knowledge.) I have tried clearing both via Windows (with TPM.MSC) and via Bios, and with neither method was I asked for a new password.

TPM.MSC reports that the TPM is "ready for use", but if I click "change owner password", it asks for the old password, despite me having just cleared the TPM.

Is it possible to clear the TPM password?

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