New scenario tests to test extra_dhcp_options would be good to have. Test should spawns vm attached to the neutron port with specified extra_dhcp_opts and then asserts that option was correctly passed and configured inside guest VM.
Verified in RHOS-16.1-RHEL-8-20210216.n.1
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory (Red Hat OpenStack Platform 13.0 bug fix and enhancement advisory), and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2021:0932