OfficeJS Word add-in development: Office.context.document.getFilePropertiesAsync() in Firefox always results in status = error

JM (LNG-RDU) 1 Reputation point

I am hoping some OfficeJS folks can identify if this is a known issue in FF for the Word Add-in API. Given code

 private getFilePropertiesAsync() {
    Office.context.document.getFilePropertiesAsync((asyncResult: AsyncResult<Office.FileProperties>) => {
        if ((Office.AsyncResultStatus.Succeeded !== asyncResult.status)) {
        } else {
            // do stuff

the asyncResult.status in Firefox is always an error. Any Chromium browser or IE (or desktop) is fine.

Office.context.document.getFileAsync() seems to be fine in FF (and everywhere else), which is what makes me suspect getFilePropertiesAsync() may have a bug. I didn't turn up anything meaningful on the MS Forums or Stack Overflow, though I admit to not spending hours searcing.

Happen to be using Java, Angular 8 for the taskpane app, in FF 84, Win 10 1909. Coworker sees the same behavior for this add-in

JavaScript API
JavaScript API
An Office service that supports add-ins to interact with objects in Office client applications.
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Office Development
Office Development
Office: A suite of Microsoft productivity software that supports common business tasks, including word processing, email, presentations, and data management and analysis.Development: The process of researching, productizing, and refining new or existing technologies.
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