Hi Emrah,
Greetings from Syncfusion support.
We would like to inform you that, the reported issue is not occurred in the 18.2.45 version. So, we may suspect that the problem occurs due to the following cases.
1. Due to the Browser/NuGet cache.
2. Outdated custom scripts referred in the application.
3. When setting true to AddSyncfusionBlazor and not added proper interop file in the sample.
Also, could you please ensure the problem after clearing the browser/NuGet cache or run the application using incognito window of the browser.
Please find the details from the below release notes details.
If you are still facing the problem, then could you please get back to us with those issue details and configuration details (.NET core version details/visual studio version details/issue reproducing sample/if possible modify the below sample to replicate the issue) that will help us to check and proceed further at our end.
For your reference, we have prepared the sample and attached it below.
Regards,
Sevvandhi N