See #2056293: Remove empty test Drupal\node\Tests\NodeEntityFieldQueryAlterTest → . This is actually a unexplained test *success* :)
There has been a test class without any test methods in HEAD for a while, when you run that with run-tests.sh with group Node or that specific class, you get the reported FATAL message.
However, in the testbot output, that class seems to be missing completely, both in the raw run-tests.sh output and the test results.
Just wondering what's going on, I'd expect that this should result in a failure, similar to my local environment?
Needs review
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It's likely this issue predates Contrib.social: some issue and comment data are missing.