Copy / Pasting or Duplicating a Widget creates multiple transactions in Undo History.
These transactions are labeled "Animatable Property changed.'
By default, three Animatable Property changed events are added to each Undo Transaction. It is possible to drive this number higher by modifying keyable properties (X / Y Position, X / Y Size, etc) prior to duplicating the Widget.
I can reproduce this bug as far back as the live 4.18.3 Binary (CL 3832480); it is therefore not marked as a regression.
Pasting the Button has created the following transactions in Undo History:
Pasting the Button creates only a "Paste clipboard contents" transaction
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-63404 in the post.