This is a regression. Tested in //UE5/Release-5.0 CL20979098
Text in an Editable Text component remains unchanged when set to an empty value by a Set Text(Editable Text) node.
The Text in the Editable Text is blank.
The text is unchanged.
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-171644 in the post.