In SharePoint Online, double-clicking on list item displays XML instead of opening InfoPath

In SharePoint Online, we have a list using InfoPath forms.  This was working fine until 2 days ago.  Now, if a user double-clicks on a row, instead of opening as an InfoPath form, it displays the xml.  Sometimes it display xml, sometimes it says "Hmm.. looks like this file doesn't have a preview we can show you."
Microsoft Edge displays xml.

Chrome displays xml.
Internet Explorer spins.

If a user right-clicks on the item and click Edit in Browser, the InfoPath form opens as expected.
If we create a new view of the list with Name (linked to document with edit menu) and click on Name, it opens as an InfoPath form.

Has anyone else run into this issue?  Is this a way to control what happens when a user double-clicks on a row in a SharePoint list?