geertveenstra@ solution works for me (for now - till next version).
Same issue with deploying to website. v6.2.1 Core & jQuery. No Javascript error.
I am deploying the app to IIS.
When I run the application using Visual Studio, I can login and Dashboard page appear. When I click on Administration menu item, sub menu appears. But when I deploy it to IIS, the sub menus do not appear. Administration menu does not expand. Also the clicking on the three-bar menu icon does not minimize the menu. Other items work fine.
appsettings.json (production & staging too):
"App": { "WebSiteRootAddress": "http://localhost/hireapp", "RedirectAllowedExternalWebSites": "" }
<br> App_Data/Logs/Logs.txt https://1drv.ms/t/s!AkBN9swsJYjbjYcPj4mNI6FwwWqbww