Battery drain on Nougat when Bluetooth is enabled

After upgrading to Nougat, I found that my Nexus 5X's battery drained much faster than before.

I did some testing and discovered that Bluetooth was responsible:
- with BT enabled, the 5X loses about 5% battery per hour, simply sitting there on the table (WiFi and Mobile enabled as well)
- with BT disabled, it's <2% per hour (WiFi and Mobile enabled)

I only use BT in my car, so usually BT should just be idle.

Any ideas would be much appreciated! :)