@ironchamber @marlinspike I tried to go back to the <Select> component to make it work - as opening a Listbox with a button still doesn't mimic the Select well enough (I might try more styling with the popover and keep it after all) - but now I'm back to the problem where I can't get the state to save.
I can't imagine it's broken. Just weird:
https://react-spectrum.adobe.com/react-aria/Select.html#selection