Hi Oswaldo,
Thank you for contacting Syncfusion support.
We have checked your reported issue by rendering the Menu in the version (17.2.40) and binding the items in OnAfterRenderAsync method from the service. And the menu items binded properly in our end without any error. For your convenience, we have prepared the video demonstration of this issue. Please find the sample and video link below.
Before that, we would like to let you know the following details to check further.
1. Please replicate your issue in the above sample and send back to us.
2. Please share your Blazor preview version and Essential studio product version.
3. If possible please share us the video demonstration of your issue.
Could you please check the above sample and video and get back to us, with the above requested information based on that we will check and provide you a better solution quickly.
Regards,
Sangeetha M