Child Actor Components class settings does not appear to replicate as expected. When the class is changed at run time, the change is not reflected on the client.
If the class is left as "none" the client updates as expected.
Result: The cube in the level will change into a sphere on the server and it will remain a cube on the client (the child actor class has been changed)
Expected: The Client would update to show the changes to the child actor component's class setting
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-66802 in the post.