Just installed reporting, in VS 2022 vb..net I add a new item Telerik Report R2 2022 (Blank) and the designer opens with the "To prevent possible data loss...' message.
I solved this by doing the upgrade project wizard which did not run the fist time I opened the designer. Not sure what triggered it to popup, but when it did I allowed it to update the project and now I can open the designer.