Symbol "Device Properties" option missing from RMB menu

What would cause the RMB menu for a symbol to change?  I suddenly have a smaller/abbreviated menu for a bunch of symbols on a page (but not all symbols on this page).  I'm trying to edit the Device Properties, but that's not an option anymore on this menu.  I know it worked previously because I've made recent edits to these symbols on this page.

If I add a new instance of the same symbol to the page the RMB menu is as expected.

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