Rocket Augmerchant not granting Rush

Steps to recreate between two players:
1: Play Imprisoned Felmaw
2: Pass
3: Pass
4: Play Skydiving Instructor, which drags out Infectious Sporeling
5: Felmaw awakens, randomly attacking the Sporeling, turning the Felmaw into an Infectious Sporeling
6: Play Rocket Augmerchant on the newly created Infectious Sporeling (Previously Imprisoned Felmaw)
Expected: Infectious Sporeling now has 1 health and Rush
Observed: Infectious Sporeling has 1 health, but no Rush

that would be consistent with previous reported interactions with Infectious Sporeling. the game considers the minion (now transformed) as already attack instead of an entirely new minion that can attack.

What about minions that are evolved into rush minions after attacking? Theyre granted a second attack under those conditions which are arguably the same

Infectious Sporeling seems to be a special case that dont behave as other transforms.