Power Up Attempted to run callback that does not exist or was not retained when card left open

[Ecosystem]

A customer of ours has filed a bug where our custom power-up button stops working if they leave a card open for an extended period of time. Clicking on the Power-up button after approximately 10 minutes yields the following console log:

export function cardButtons() {
  return [
    {
      icon: logoGrayUrl,
      text: 'Manage Time',
      callback: function (t) {
        return t.popup({
          title: 'Manage Time',
          items: [
            {
              text: 'Track time',
              callback: startTimer,
            },
            {
              text: 'Attach time report',
              callback: attachHoursBreakdown,
            },
          ],
        })
      },
    },
  ]
}

window.TrelloPowerUp.initialize({
  'board-buttons': boardButtons,
  'attachment-sections': attachmentSections,
  'card-buttons': cardButtons,
  'format-url': formatUrl,
})

 I'm guessing the context is going stale. Is there a solution for this that I can't seem to find?