internal hyperlinks not saving

We're having a strange issue. Documents with a list of references, first step, set each reference as a Text Anchor. Then set the callout in text as a hyperlink to that anchor. Simple enough. Worked fine up until about a month ago. Now after setting anchors and hyperlinks, then saving, upon reopen, links are gone. Previously set text anchors are not anchors any more. Very weird. URL hyperlinks save properly; just links within the documents are affected. Issue occurs when saving both across network and on local drive. Multiple users experiencing this, all on most recent version of InCopy.