The vector properties won't be available in Premiere Pro when importing an After Effects comp in a Premiere Pro project. The upscaling in Premiere Pro is applied to the preview generated for the After Effects frame which is not the same as scaling a vector layer in After Effects. To get the best results you may set your Composition settings in After Effects to match the Sequence settings in Premiere Pro. In case you want to do some upscaling in Premiere Pro, you may even set a higher resolution for the Composition to avoid any quality loss when the After Effects comp is upscaled in Premiere Pro. Hope it helps. Let us know if you have any questions. We're here to help.