The dialer and call apps are often vendor specific. Even Google is not using the open source version of the dialer and call app. That said, since so many differ

The dialer and call apps are often vendor specific. Even Google is not using the open source version of the dialer and call app. That said, since so many different vendors have this issue, the problem probably exists upstream. Thing is, this could get (or already be) fixed upstream and none of the people complaining will ever see the fix on their handset because of lazy, slow patching strategies and myriad of forks among vendors. Android phones are, unfortunately, a lot like windows laptops. The manufacturer uses proprietary drivers and hardware when it shouldn't, MAYBE releases an update within the first six months after release, and then the device is as good as abandonware.