Feature #3177: Upgrade bbPress to 2.x
Ensure that old forum permalinks work after migration
In #3177, Ray said: "There could be a permalink issue if a WordPress post slug is the same as a bbPress 1 topic slug during conversion. The chances of this happening is slim, but could happen. But for the most part, permalinks should be the same."
So, this is good news. This ticket is a reminder to do some spot checking after migration.