Reproduced 3/3 times. Issue also occurs in //UE5/Release-5.0 - CL 20979098 Binary. Confirmed NOT a Regression.
Actual Result: Value is set to 1, visual display of value does not change
Expected Result: Value should not change at all
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-170321 in the post.