In this version of Twinmotion, effects from Frosted Glass are not visible - not only in preview (Real time render), but also in final render. I've tried different level of roughness. In previous version this material worked fine.
The glass materials in Twinmotion 2023.1 were reworked to be more robust, but unfortunately there is a current limitation preventing frosted glass from applying a blur or distortion effect behind it. The team is aware of this and looking into solutions for this.