This looks like a product bug. You'll get more response by logging your issue on GitHub - https://github.com/officedev/office-js/issues
Please be sure to include the version of word and if you can fiddler/use browser debug tools to determine the URL of the new URL, that will make it easier to diagnose.
1 vote1 comment · Feature Requests and Feedback » Add-in: Shared APIs · Flag idea as inappropriate… · Admin →
The best place for reporting Microsoft Teams suggestions is here - https://microsoftteams.uservoice.com/forums/555103-public
1 vote1 comment · Feature Requests and Feedback » Office Store & Catalog · Flag idea as inappropriate… · Admin →
The best place to report this suggestion is on the Word UserVoice as they are responsible for most spell check in Office 365. https://word.uservoice.com/