Complete DNS failure after frequent switching between WiFi and Mobile networks

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Studying the log of the Pixel phone, I recognize two main problems:

  1. name detection not working:
    Connectivi Wifi network fallback name detection returned null
    Connectivi Network up: 987987878979877, (null, type=WIFI)

  2. Detection of “network down” in case of wifi is sometimes not working. E.g. when wifi is manually turn off and cell is turned on, blokada’s block shows only the following entries (even after wifi been turned off):

Connectivi Network up: 786786876876, (XXX, type=CELLULAR)
W Connectivi Guessing which wifi network to use: (null, type=WIFI)

Then connectivity is lost, due to missing dns resolution.

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