Last year on IROPS I would routinely get rebooked into Y fares and then would get the 50% bonus posted to my account. Last Sunday I was stranded in ATL for the night (mechanical) and rebooked into a Y fare for the following day. When my miles from that flight posted this week, it shows:

Fare class paid: T
Fare class flown: Y

No 50% bonus for fare class posted. Sadly, I think Delta may have "fixed the glitch" and removed that bonus from reissued tickets during IROPS.