No way to wait for WorkflowCancellation

[saguziel]

I have a workflow where I launch a child workflow. I have something roughly like
try {
} catch (e: CancellationException) {
Workflow.newUntypedExternalWorkflowStub(childWorkflowId).cancel()
logger.info("Cancel successful")
}
but even when I confirm it gets to the log line, the child workflow does not actually end up cancelled.

https://github.com/uber/cadence-java-client/blob/6bbb9971de9b89b3b23883cacc6fb178336d7721/src/main/java/com/uber/cadence/internal/replay/DecisionContextImpl.java#L228

Based on this, there is no way to wait.