Anchors prevent redirection of KB URLs that have been changed
Sorry if this isn't the correct place for what amounts to a bit of a bug report. I had put it in the community, but got the useless "call support" response.
In our helpdesk we have recently updated some of the URLs of articles and Hubspot does a great job of redirecting to the new one if the old link is used, however this does not occur when the old link is used with an anchor: