I have a question about "Select2 on Android"

--> does work if it comes to the single select dropdown (see green frame --> whole area works as selector)

--> does NOT work if it comes to the multiselect dropdown (resp. only works as selector if you press burger icon in red frame, does not work as selector in blue frame area --> also arrow is missing in multiselect dropdown though available in single select dropdown)

Any suggestions how to make the Select2 for multiselect dropdown work on Android as it works for single select?