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A wire whose terminals have uuids is saved against them, and on load it is reattached to a terminal with that uuid or dropped, with only a qDebug line. Re-importing a changed symbol and choosing "replace" swapped the project's definition for one whose terminal uuids differ; the placed symbols kept the old ones until the project was reopened, so every wire on them was lost at the next open, silently, and gone for good at the next save. - XmlElementCollection::copyElement(), where an embedded definition is overwritten, carries each old terminal uuid onto the new terminal at the same place and orientation (TerminalUuids::keep()). Terminals that moved, and new ones, keep their own. - Diagram::fromXml() records wires it could not reattach, logs them, and the editor lists them in one warning after opening a project. Measured on 2612_ats_singlephase.qet with the stored splice's terminal uuids made to differ from the collection's: replace, save, reopen loads 34 of 131 wires on master, 131 with this change (GUI, both arms). tst_terminaluuids covers keep() and runs the real loader. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>