Create any of the following material graph nodes which should now display a tooltip: Arcsine, ArcsineFast, Arccosine, ArccosineFast, Arctangent, ArctangentFast, Arctangent2, Arctangent2Fast, Round, Saturate, Truncate, PreviousFrameSwitch.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-41193 in the post.