Memo-s not present in listOpenWorkflowExecutions when running with temporal-testing

Expected Behavior

I'm using temporal-testing and when I query running workflows:

        List<WorkflowExecutionInfo> executions = client.getWorkflowServiceStubs()
                .blockingStub()
                .listOpenWorkflowExecutions(
                        ListOpenWorkflowExecutionsRequest.newBuilder()
                                .setNamespace("default")
                                .build()
                )
                .getExecutionsList();

        executions.forEach(execution -> {
            System.err.println(execution.getExecution().getWorkflowId());
            System.err.println(execution.getMemo());
        });

memo is empty despite being filled in workflow.

Actual Behavior

The same piece of code run with setUseExternalService(true) and temporal server start-dev running outputs memo-s as expected.

Steps to Reproduce the Problem

I prepared reproducer project: https://github.com/rpost/temporal-test-memo/blob/main/src/test/java/rpost/MemoTest.java

Specifications

• Version: io.temporal:temporal-testing:1.28.4

Start with the reproducer in src/test/java/rpost/MemoTest.java and compare its temporal-testing path with the external-service path. Trace how listOpenWorkflowExecutions supplies WorkflowExecutionInfo memo data in the testing environment. Done means the reproducer returns the workflow memo when using temporal-testing, with the behavior verified by a regression test.