Currently, when filling tests that contain transactions that are supposed to create contracts, evmone-t8n command fails when execution-spec-tests passes a transaction that contains the to field equal to JSON null, which is what currently geth accepts.
When currently can workaround by hard-coding an empty string in these cases into the field instead of null, but since we would like to have an unified behavior, it would be nice for both tools to accept the same input.