This test fails since it was added in r351248:
This is almost certainly the result of the same i386 bpf issue as #239380.
A commit references this bug:
Date: Tue Sep 17 22:09:14 UTC 2019
New revision: 352463
Temporarily skip sys.netpfil.common.tos.pf_tos on i386 CI as it always fails
Sponsored by: The FreeBSD Foundation
*** This bug has been marked as a duplicate of bug 239380 ***