Calcite Undefined Error Demonstration

Error Log

Uncaught TypeError: undefined is not iterable (cannot read property Symbol(Symbol.iterator))

How to Run

    npm i
    npm run dev

Error Context

• Error appears when leaving a page with CalcitePopover (configured with a referenceElement) containing a Calcite List.
• Error may occur as far back as 1.9.2, but I have not tested prior.
• Error occurs with or without activating popover.
• This error may also appear when Calcite Popover contains other elements, though I have not tested them.
• See "Popover with interactive content" sample and check dev console for error: https://developers.arcgis.com/calcite-design-system/components/popover/