Steps to reproduce:

• Clean install of experience
• Create an attribute group
• Create an attribute inside this attribute group with identifier `test1`
• Create a product type and add this `test1` attribute to it
• Go back to attribute list
• Try to remove this `test1` attribute

Error appears saying

An exception has been thrown during the rendering of a template ("Could not find 'Ibexa\ProductCatalog\Local\Persistence\Values\AttributeDefinition' with identifier 'test1'").

admin becomes just unsable. you can see same error in `/admin` for instance.

Error only goes away if you manually remove caches with `php bin/console cache:clear`, so looks cache issue to me.