I have this issue too and I am using an aftermarket Pioneer AVH-X8500BHS head unit. However if I'm listening to Bluetooth audio, the audio will go quiet for a second as if a notification came in, but no notification will go through the speaker system and the phone won't make noise either. It's quite annoying cause then I have to look the phone to see what it was. I also have the same issue when using Motorola assist where it will understand the command but I can't hear the response.
Is it possible to set something up in Tasker to be able to play the sound through the phone speaker while still retaining Bluetooth connectivity for music?
I have also tried tinkering with the Bluetooth settings in the new assist that gets upgraded and 4.4.2, but to no avail.
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Motorola Moto X™
Firmware: Kit Kat 4.4.2
Current ROM: Stock (no root allowed on work phone
Sprint: Palm Pre -> Epic 4G -> Evo -> Nexus S -> Epic 4G Touch ->
AT&T: SGSII -> Nexus ->
Sprint: Nexus -> iPhone 5 (Worst Phone Evar) -> Nexus ->
Verizon: iPhone 5 (forced by work) -> SGS4 -> iPhone 5 (forced by work) -> Moto X (until I get yelled at again)