fmgr_oldstyle calls from 8.0.0RC2 trigger

I'm trying to implement a trigger within 8.0.0RC2.
I get a segfault when the trigger is fired, valgrind
reports an illegal read being the line:
       TriggerData *trigdata = (TriggerData *) fcinfo->context;

Valgrind reports:

==941== Use of uninitialised value of size 4
==941==    at 0x3CD9C197: cache_bbox (lwgeom_triggers.c:10)
==941==    by 0x825C274: fmgr_oldstyle (fmgr.c:637)
==941==    by 0x81258C8: ExecCallTriggerFunc (trigger.c:1149)
==941==    by 0x812646F: ExecBRUpdateTriggers (trigger.c:1525)

Isn't fmgr_oldstyle the Version 0 function caller ?
Shouldn't triggers be defined as Version 1 ?

TIA

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