RegisterCustomElement stopped working in Blazor 8

### Is there an existing issue for this?

- [X] I have searched the existing issues

### Describe the bug

I upgraded the solution as found in https://github.com/khalidabuhakmeh/BlazorCustomElementsSample to .NET 8. Now the customelement no longer loads. If I use the old blazor.webassembly.js the customelement loads.

### Expected Behavior

I expect that the customelement is loaded.
see branch feature/net8 in repo https://github.com/rudibelt/BlazorCustomElementsSample

### Steps To Reproduce

run the code in featre/net8. customelement is no longer loaded

### Exceptions (if any)

_No response_

### .NET Version

8.0.100

### Anything else?

_No response_