Autocomplete bug in VoiceOver on MacOS

[plousia]

To clarify, I am not using this code myself, but I recommend the autocomplete pattern to accessibility audit clients. While testing the demo using VoiceOver + keyboard navigation on MacOS, I note a bug: VoiceOver says to use Command + Option + Space to open the combobox and view the options, but this does not work; the list opens briefly and immediately closes. This key pattern combination does work in this W3 autocomplete example.