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The item store read, listed and removed every workbook-scope name of the `_gc_<key>_<n>` shape, visible or not, so saving an item removed a person's own visible name that happened to look like one. Items are the hidden names the store writes; a legacy `_sc_<key>` name still reads. A visible `_gc_` name is left alone by every operation, and writing an item that would need that name is refused before anything changes: a hidden name beside it with the same name is the one an xlsx file drops, so the item would be lost on save.