Not sure where to post this...
but there's a minor bug in components/toolchain/system_nrf52.c, where NRF_UICR->PSELRESET[0]
is being checked twice to see if a reset pin is connected, and NRF_UICR->PSELRESET[1]
is never being checked.
Probably benign in most cases, but please see attached for a patch.