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I wrote a quick & dirty migration process (look for all report comments without [plain][url= or [url][/plain]), then parse & save the result if it changed), which worked quickly.

It is mostly an issue since I use user mentions in the old XenForo 1 text format, which I've migrated to the bbcode user mention format ([plain]@[Xon:71874] vs [user=71874]Xon[/user][/plain]). And then noticed the urls