Non-existent variant is available

I have created a ball bearing as a variant article. A selection criterion is the storage air CN or C3. The warehouse 65x100x18 is created in the database only with the storage air CN. In the configurator I am also offered C3 for this warehouse. When I add this warehouse to the shopping cart, the dimensions of the first variant appear there.
Normally, this storage air warehouse would have to display C3 as „not available“.
Can anyone help?