Changing the time snapping interval in UMG Sequencer doesn't seem to update the timeline. It appears to stay as though it is being snapped by time rather than frames.
This is a Regression from 4.15 @ CL 3257883
Result: The Timeline stays the same and shows time rather than frames
Expected Result: The Timeline updates and it shows the frames rather than the time
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-41311 in the post.