Oh, indeed, that's quite surprising. A TLSv1.3 Client Hello always contains the supported_versions extension, which should allow wireshark to label it correctly, regardless of whether or not the handshake actually finishes. Though, tbf, it does say TLSv1 and not TLSv1.0. I wonder how it would look had TLSv1.3 been named TLSv2.0 after all...