Dropdown doesn't work with virtual scroll, split button issue

Hello,
I ran into problems with dropdown and split button when using iX for development of our application. I created an issue for that on github with details and working example: Dropdown doesn't work with virtual scroll, split button issue · Issue #1136 · siemens/ix · GitHub

Can someone please take a look at this? We are unfortunately forced to switch to another solution for dropdowns until this gets fixed. Thank you in advance.