Update:

The problem with validation affects different parts of the system (not only product-catalog) e.g. Object states where field identifier exist. What is also worth to mention, the problem occurs on lower version v3

Steps to reproduce:

1. Log in to back office.
2. Go to Product catalog / Attribute groups or Attribute.
3. Start creating a new Attribute group or Attribute.
4. In field 'Identifier' provide special characters e.g. @@@#$%^
5. Publish.

Actual result:

See attached screenshot.

An error 500 occurred when special characters are provided in field identifier for newly created Attribute group and Attribute.

Cache key "ibx-ag-@@#$%" contains reserved characters "{}()/\@:". 

Expected result:

Validation do not let user create a new Attribute group or Attribute when in field Identifier are special characters.

NOTE:

We can implement the same validation as it is already implemented in adding new Product type form (screen: product_type).