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I am writing this post because I’ve been asked four times within two weeks, so it acts as a public service announcement :-)

The stage is still successful. Looking deeper into the execution by setting System.Debug to true, you can see in the logs that it might have got to do with the Service Principal in the ARM deployment task:

In reality, it doesn’t - there was definitely some change to the out-of-the-box task, as this is not the expected behaviour.

This GitHub issue explains what the problem is, and hopefully it will be sorted soon!