Hi Mike,
We have checked your reported issue, You may use the deprecated component name in the application with the Syncfusion Blazor NuGet package version greater than or equal to 18.1.0.36.
The Syncfusion Blazor library has changed its namespace, NuGet package name and component name from v18.1.0.36. Refer this documentation to migrate your application with correct component name. Example: EjsDropDownButton is now modified as SfDropDownButton.
For your reference, we have prepared a sample based on this, please refer below link.
If you still face this issue due to the following cases.
· Due to the old Browser/NuGet cache.
· Outdated custom scripts referred in the application.
Also, could you please ensure the problem after clearing the browser/NuGet cache or run the application using incognito window of the browser.
Please let us know, if you need any further assistance,
Regards,
Mohankumar R