Default "Ok Google" responses now come over bluetooth

My car is a Nissan Rogue 2012 and it does not have A2DP for bluetooth and only allows phone calls to go through my speakers in my car. Lately when i use the bluetooth calling through my car it has not been working. Well I decided to do the "Ok Google" voice command through my phone and my car picked up the audio as if it was in a phone call and the response was played over my car speakers. This has never happened before and is a great addition. Does anyone know if the new Google Search update added this feature for some reason? Anyone else having the same thing happen to them?