Hi Christian,
We have considered this as a usability feature improvement “Problem with DataOperations when bind IQueryable data to Grid”, and logged a task for the same.
You can now track the current status of your request, review the proposed resolution timeline, and contact us for any further inquiries through this link.
We have planned to implement this feature in our Volume 4, 2019 release. Until then we suggest you to bind List values to Grid to overcome the problem you are facing.
Regards,
Balaji S.