In 4.22, temporal AA rendering artifacts can be seen on MotionControllerComponent attachments. Other AA methods look to be working without artifacts.
Not seen with Oculus
Workaround: Set "Disable Low Latency Update" on your Motion Controller Components to 'true'
Result: Temporal AA Rendering artifacts visible
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-74991 in the post.