I have read a few reports of original routing accrual. However, ANA's rule is
https://www.ana.co.jp/en/jp/amc/refe...integrate.html
Mileage will not be accrued if the flight is not actually used. (This includes cases involving delays and cancelations.)
Not a partner case but my past experience about rerouting accrual.
Oirginal: ANA:OKA-KIX, JAL:KIX-HND (separate tickets)
Because of ANA's OKA-KIX delay, I couldn't make KIX-HND flight.
ANA reroute me to ANA's OKA-HND.
Mileage is credited as ANA's OKA-HND.
No credit for ANA's OKA-KIX, nor JAL's KIX-HND.