Hello, I managed to get this resolved.
If anyone’s wondering how, I clamped the Alpha’s of the two Lerp nodes (which wasn’t required in v4.18, v4.19).
However, I just noticed that the bug report for the above issue was marked ‘By Design’ yesterday (14th Feb 19) on Unreal Engine Issues and Bug Tracker (UE-67936) .
Can someone please explain what changed from v4.20?