OperationErrorTestCase by design does things that put the HCs in restart-required state. This makes it an improper member of DomainTestSuite. The purpose of suites like DomainTestSuite is to reuse the domain across test classes, saving the cost of starting up and shutting down a domain. But a test that puts the domain in restart-required negates that benefit. It's better to just let it run on its own.

OperationErrorTestCase doesn't attempt to clean up the domain; it just leaves HCs in restart-required, which may break later tests that use those HC processes.

This test is what caused the WFCORE-5087 test to fail when run along with the entire domain testsuite. The WFCORE-7137 work revealed this test to be the issue.