Combobox does not work correctly with screenreader (TalkBack) on Completed

There are 2 main issues i found using a combobox for people with impaired vision. 

One, when you click on the filter field, a double tap should open the combobox options, Just as tapping it normally would. But it does not, only tapping the little arrow works. 
This is a issue, as visually impaired people might not see the little arrow all that well. 

Two, the options once the combobox is expanded are very hard if not impossible to select. 
If you only have 1 item, you literally cannot select it. 
If you have more, you can navigate to it, but the order in the semantic tree is completely wrong. It thinks the combobox list is at the bottom of the screen. 

I have made a video showcasing this, but i cannot add mp4 attachments or any other video format for that matter.