Ember: Binding properties in partial-templates of components

Ive got a component which has two partial-templates. In these templates Im using properties of the JS-Backend like {{myVar}}. When updating this variable in my JS (this.set('myVar', 'newValue');) the template (the partial) wont update like it is not bindet to that property in the browsers HTML.

When accessing the property in the "main" template.hbs of my component, it works fine.

Could it be that ember wont bind the helpers in the partial templates like it does in normal templates?