Cannot display the span name using TraceClassDecorator

[ruthwang97]

I am trying to use TraceClassDecorator in sentry/angular, but I don't see a name displayed for it like it did with traceDirective:
ui.angular.init | < r >
Is it supposed to show the class name as the span name following ui.angular.init instead of < r >?
I don't have sourcemapping set up and I am not sure if that is the reason why the name is not displayed.

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What I tried: I added @Sentry.TraceClassDecorator() before export class ClassName and imported Sentry in the file. TraceDirective works, but the decorators don't work.