"Undo" impossible After wrong Paste in extra column

[Frédéric]

In an EXTRA COLUMN, the contextual right-click drop-down menu offers "PASTE DATA :" option.
After a wrong click, I can't undo the changes to retrieve previouss tags.

[admin]

Not a bug. Tagging does not support undo. But you can always do "Restart without Saving" (menu File).