Here is a sample page from the logs: fiwiki:Käyttäjä:Zache/kunnat, oldid: 17558333
https://logstash.wikimedia.org/app/kibana#/doc/logstash-*/logstash-2019.06.20/parsoid?id=AWt1aipX0jm7pOHZHXPE&_g=h@1251ff0
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This is probably some old bug that just got lost in the noise of other ignoreable log reports. We should seriously kill a lot of our non-actionable logspam (error/lint, error/lint/api, warn/*).