Hello ,
After looking into this I found out that this is actually by design. A bug existed where it did rotate on all axis in previous engine versions, but that caused multiple issues with performance and not being able to make changes to the rotation.
That issue was fixed and the rotation stays at zero now, by design. I hope this clarifies any concerns and questions you might have relating to this. Please let me know if there is anything else that I can help you with.
All the Best,