Asus ZenPad Z380KL - problem with charging while using OTG

Hi guys, I have a problem with my Asus Z380KL tablet. Im want to use this tablet as a head unit in my car and I need to use OTG cable to make it work, also I need to have charging in the same time. I also want to use AutoMate app to control tablet, especially auto on/off while charging/not charging.

And now is the problem, I can easily achieve working external devices (usb dac, FM transmitter and pendrive) with charging in the same time, problem is when I cut off the power from charger tablet still thinks that is charging, of course it cant be cause there is no power source but still I can see charging icon and in settings showing that is still charging. It stop doing that when I unplug micro usb plug from tablet but obviously I cant do it all the time cause tablet will be build in dashboard.

Now, with normal charger, without OTG cable its working perfectly, when I cut off power it stops charging in the same time, also I tried couple OTG cables and on every single one is the same thing.

Any ideas guys how I can fix that? Im not sure if thats software of hardware problem.

Also device is not rooted and it has ASUS oem software with Android 6.0.1.

Thanks guys for your answers and your time! Cheers

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