Regression in 3.0.5 for accessing static constants in closures

Up to 3.0.4 (including 2.x) it worked perfectly fine.
Starting with 3.0.5 it does not work anymore.

This is one of the classes where this is happening:

https://github.com/Vampire/spock/blob/issue-1177/spock-specs/mock-integration/src/test/groovy/MockingIntegrationSpec.groovy

It works fine if I use Groovy 3.0.4 and it fails with a MissingPropertyException as soon as I switcht to 3.0.5.