ProblemChanges should only filter for tags indicating a 'problem'
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Description

Special:ProblemChanges should filter only for tags intended to draw attention to potentially problematic edits, not all tags (since there are many innocuous tags like 'HHVM', 'VisualEditor').
I think this should filter for tags defined as 'important' in commit 190656. These are tags that should prompt a patrol for T89553.