ECM-G1 auto volume not working on A7C2？

[MewLee]

I used to combine ECM-G1 with my a6700 and ZVE-10, the auto volume function works great with those cameras, just contented G1 with MI-hot shoe, then the volume adjustment in camera will turn gray and G1 will take care of everything.

Recently I've upgrade to A7C2, but when I connect G1 to A7C2 on the MI-hot shoe , the volume adjustment in camera still working, I‘m wondering if this means that the auto volume on G1 mic is not working with A7C2 and I've to manage the dB value by myself?