Thanks again for providing us with the additional information and projects, which has been reviewed by our quality assurance.
Please note that time-stretched audio events require to be mixed down (via Track Freeze) in Cubasis, to be correctly imported within Cubase. Same goes for external or unsupported instruments and effects.
In this regard, I suggest to create a snapshot of your original project first, before proceeding with these steps. Additionally, please have a look at the “Unfreeze Deletes Audio Track” option located under Setup/Arranger, if you plan to transfer both rendered audio tracks, alongside with the original MIDI tracks.
Hope that helps to solve the problem.