@tobsend
This issue was for the OP6 not for the Pixel 2.
So it might no be related ; please open an issue on your device's repository if it can be confirmed by another Pixel 2 user.
@ut Reading again the OnePlus 3 forum posts, this looks like a problem of the 3T(?). My OP3T is A3003. Just installed e.foundation and no incoming call volume sound problems. In the past had Lineageos on this device and also no problems.