The failing code is here:
https://github.com/p1c2u/openapi-schema-validator/blob/4d8fd4c2bddce50931ea617bca54d526ae0535cd/openapi_schema_validator/validators.py#L78-L96

It does look very strange that the new evolve method doesn't keep the attributes of the OAS30Validator class.
There they have an @attrs class. It defines a read and write attribute. And after evolving, not only are the read and write attributes gone, but super calls as line 96 don't work either.

I have also made an issue in their project: python-openapi/openapi-schema-validator#46

I am not sure which one of the projects should update. But I feel that this new evolve method only does half of what it used to do and is not good enough to replace an attrs.evolve