Gitlab activity RSS feeds a mix of absolute and relative URLs
The new Groups page uses Aggregator to show an RSS feed of Gitlab activity: for some reason the Atom XML generated, (ie https://lab.civicrm.org/community.atom?feed_token=dCTLD7352jXVMmM7TG-h) is a mix of relative and absolute URLs. If it's a Commit or a New Issue, the URL path is a complete link (https://lab.civicrm.org/path/to/activity). If it's a comment on an issue, which uses a #, it's relative (ie /path/to#activity) which breaks the view on /groups creating links that look like https://civicrm.org/path/to#issue instead of https://lab.civicrm.org/path/to#issue. But as it's not on all items this can't be over-ridden in views.
Maybe this is an issue to raise with Gitlab as it seems odd behavior. For time being, simplest fix would be to just show a list of 'Issues' rather than recent activity. Or JS & Regex cd make sure all links include https://lab.