Wrong hostname reference anchor
referencing.exceptions.InvalidAnchor: '#definitions/hostname' is not a valid anchor, neither as a plain name anchor nor as a JSON Pointer. You may have intended to use '#/definitions/hostname', as the slash is required *before each segment* of a JSON pointer.
We need to fix this. This was merged with custom DHCP
not so long ago and it seems like an error. Altought tests are passing so maybe it gets parsed anyway.