Link to project reproducing the bug: https://github.com/dgrayling/forceSaveFailedBug/tree/main
Basically I try to load the document ooxml from a document with footnotes and it never returns from the await context.sync, the only thing that happens after more than a minute is: POST https://word-edit.officeapps.live.com/we/OneNote.ashx?perfTag=ForceAutoSave_1%3BOoxmlSelection_1 net::ERR_NETWORK_CHANGED
Edit: This is strictly on Word online, this error does not occur on Mac Desktop.