CC5 to Unity - Facial Expressions/Phonems break

Hello,

When I import a character from cc5 into Unity with CC/IC Importer, all the blend shapes (expressions and phonemes) that also open the mouth are broken. The blend shape is then practically without the movement of opening the mouth. This is particularly bad for the phonemes for lip sync. The current workflow is to import the character into Blender and combine all relevant blend shapes with the Merged_OpenMouth blend shape and recreate them. This is a time-consuming workflow, and I think there must be a better way, right? Thank you very much.