now i get my hands dirty in here... from if_ethersubr.c:

there was code inside
#if NPF > 0
to prevent feeding back the mbuf do looutput if we are on simplex
interfaces and the packet has been routed by pf, which can lead to a loop
in weird corner cases.
apparently nobody triggered these cases in ages, since pf.h was not included
and thus NPF not defined and thus this code not compiled.

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