„unable to resolve host“ when mobile and alternative DNS activated (not when wifi)

My (german) provider is PennyMobil (Congstar / Telekom).

Now I tried a diffrent sim-card (sim.de / Telefonica) and the problems with the alternative DNS providers were gone. It worked correctly with no problems.

So I guess, that the problem is not Blokada because:

  • some problems with the Blokada alternative App “DNS66”
  • no problems with Blokada when using a diffrent provider

Same problem, unfortunately without a solution:
https://forum.fairphone.com/t/after-updating-to-android-10-no-more-alternative-dns-servers-nach-update-auf-android-10-keine-alternativen-dns-server-mehr/64456

So how to deal with that issue?

Anyone a good idea?

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