Functional tests need to specify $defaultTheme. Many were set to classy, but classy is deprecated for starterkit.
If not set, set to Stark.
Follow up: if set and is classy change to starterkit
background: https://drupal.slack.com/archives/C014CT1CN1M/p1658773328056659
quickly made issue due to time, can flush out later.
Needs review
Code
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It's likely this issue predates Contrib.social: some issue and comment data are missing.
Been a while, but fixed the PR again so it works again.
Automatically closed - issue fixed for 2 weeks with no activity.