Github user StephanEwen commented on the issue:
https://github.com/apache/flink/pull/4451
Is this really the root of the problem, or is this maybe affected by this:
https://github.com/apache/flink/blob/master/flink-runtime/src/test/java/org/apache/flink/runtime/executiongraph/ExecutionGraphTestUtils.java#L203
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