Hello @sando38 and thanks for your interest in Traefik,
The priority field is a valid one as explained in the documentation and in the CRDs, see traefik/traefik.containo.us_ingressroutetcps.yaml at master · traefik/traefik · GitHub.
So my guess would be that your CRDs are not up-to-date or valid.
Is it the case?
Hope this helps!