Broken DNS settings in Browser for some users after updating to /e/OS 0.16

• /e/ version: 0.16-p and 0.16-q
• Device model(s): FP3

Summary

Reported here and here and here.

The problem

Steps to reproduce

Update to 0.16.

I wasn't able to reproduce the issue on my FP3 though.

What is the current behavior?

1. In Browser > Settings > Privacy and security > Use secure DNS > the default setting for some users is "Choose another provider".

2. This new default setting causes websites not being reachable:

The site can’t be reached
…
Try :

    checking the connection
    Checking the secure DNS configuration
    ERR_NAME_NOT_RESOLVED 

What is the expected correct behavior?

It should work no matter the setting.

Technical informations

Relevant logs (adb logcat)

Relevant screenshots

Solutions

Workaround

Set back the setting to "Use your current service provider".

Possible fixes