Unable to open document links from within copyholder

When I have a document open in a copyholder, I cannot open any document links from within the copyholder. I’ve tried left clicking the links, and I’ve tried right clicking them and then clicking “Open Document Link in Quick Reference Panel” in the context menu. I’ve also tried creating new links to the same documents; no luck. The same document links open just fine from within the editor and quick refs. External links (e.g. web pages) do work normally from within the copyholder.