5.0 material instance detail panel break

I just created a project using UE5.0.3 third person CPP template.

The Unreal engine will break when I open the material instance detail panel and it will say a breakpoint instruction executed.

How can I fix it? I wasn’t expect the default template to have this problem.

Still don’t sure why it run like this. What are been duplicated?

But I just click continue and keep working on.