Hi Alex,
Greetings from Syncfusion support.
We have checked our Calendar component in the PWA Blazor application. But the reported issue is not occurred at our end. Please find the screenshot below.
For your convenience, we have prepared the sample and attached it below.
Also, the issue may be caused due to the browser cache or NuGet cache in your end. So, we suggest you to clear the NuGet cache and browser cache. Please refer the below KB link for clear the NuGet cache.
To know more about PWA with Syncfusion Blazor components, please refer the below link.
Regards,
Berly B.C