The name 'partnerId' does not exist

Hello Radzen Team,
from one of the last radzen updates i receive the following messages in designer:

(this message comes from button components)

but partnerId is a normal property set in the Load event:

Can you help me out there? I think its a bug in the designer....

Kind Regards

The last few releases didn't include any changes in the designer. It is probably an older issue. We would need a sample application (or at least a page) which demonstrates the problem.