How can I prevent wireless tethering from being disabled when I receive a call? I use my phone (a OnePlus 3 running the stock ROM and Android 7.1.1) as my primary internet connection. This means that I make heavy use of wireless tethering, especially for work. The trouble is, whenever my phone rings, regardless of whether I answer it, wireless tethering gets disabled. If I use USB tethering, I have no such problem, but wireless is much more convenient.

Is there any way to prevent wireless from being disabled? I previously came across this answer, but it doesn't apply to me. I've never had a phone which was unable to simultaneously use phone and data. When I'm on a call, I can enable wireless tethering no problem. It just gets disabled for no good reason whenever I receive a call.

Failing my first question, I would also accept a method to make my phone completely ignore incoming calls during specified times, so that they couldn't disable tethering, so long as I kept internet access and text messaging.

EDIT

In response to comments, let me point out that the issue is not the connection technology (WCDMA, VoLTE, carrier support, etc.) This is absolutely impossible, since the fact mentioned above that I can manually re-enable tethering while on a call, coupled with the fact that I have full access to data while on a call, disproves any such theories. This is why I started a new thread instead of using the old one I linked to above.
On my LG K20 running 7.0 I have “Do Not Disturb” under” Settings > Sound &amp; Notification”. With that turned on, incoming calls do not turn the WiFi hotspot off. I just now tested it to make sure. I can leave it on until I switch it back off again myself or I can set a timer that will turn “Do Not Disturb” off after a specified length of time.