Accessibility tree not showing selected option in selector

[hage1005]

As title, here's an example:

Accessibility Tree:

[5265] StaticText 'For accurate reporting, be sure to refresh lifetime statistics whenever you change the time zone.'
[5268] link 'statistics'
[5269] StaticText ', click '
[5270] link 'here'
[5271] StaticText '.'
[5382] group 'Filter'
	[5663] StaticText 'Period'
	[5664] combobox 'Period' hasPopup: menu expanded: False
	[5773] StaticText 'From'
	[5667] textbox 'From *' required: True
	[6725] button 'undefined \ue627'

In the image, we can see that Day is selected for period, but this can't be inferred from the accessibility tree due to expanded: False. Maybe this can be fixed by adding aria-expanded="true" attribute to the <select> element?