Thank you for your patience all this while. Fix of the issue is now available and can be downloaded using the link below. https://helpx.adobe.com/indesign/kb/Script-UI-dialog-issue.html . You may click on the link and follow the quick steps to fix the issue in latest 14.0.2 update. Let us know if you face any problem with installing the fix.
An update (14.0.1) is now available for InDesign CC 2019. The update contains the fix for this issue.
Please install this update via the Creative Cloud application.
Adobe InDesign teamAnonymous commented
Same problem, export works only in interactive mode.
This is a big urgent issue!
CC2019 on mac os high sierra