Angular Template Error when using Signals

I wanna switch from @Input/@Output to Signals in my Code. But if i change @Input to a signal "test = input.required();" the template dont recognize the [test] anymore.

I Am using Angular v17.3.5

Error

Template

Input decleration

The strange thing is.. it works anyways but the errors are kinda annoying. Any Solution ?

EDIT:

App Module

More condensed NgModule Where u can see that both Child and Parent Component are declared.

Parent Component Declaration

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