I've created an anchor named testduck and then a link named #testduck; however, when I select the link, Confluence opens that same page in a new tab in chrome.
This function has worked in the past. All preexisting and new anchors/links have this issue.
I have also tested in Edge.
Assuming the version is 8.5.4
Powered by Atlassian Confluence 8.5.4 (Node-144.70.119.102: 78888fc4)