Although I can find no difference in the Blueprint, when I copy a Text List with a procedure for a popup attached; a pasted copy of the Text List requires me to re-enter the Procedure for the popup to work. Option dragging does not add this requirement and the popup works as intended.
Using the Text List in a Tab Panel also retains the popup even though that’s another case of the object being reproduced.
The id number does change in all cases, so it’s baffling that copy/paste has this effect, but not a serious bug by any means.