When changing UI scale, dropdownlist is shown inverted and the bottom item is not shown.
macOS 10.14.6
Illustrator 2019, 2020
Dropdown list is shown inverted when changing UI scale.
It seems to display correctly when I mouse over it, but the bottom item is not actually displayed.
These defects can be resolved by making the UI scale the smallest.
This is a very troublesome problem as a script developer.
I expect an immediate fix.

I am happy to share that we have fixed this bug in our latest release – 25.0 which is available worldwide now.
Going forward, our goal is to fix as many top User-Voice bugs as possible and as frequently as possible. Given the nature of the fixes, some of the bugs will take a longer time to fix, but we are on it.
You can update to the latest release using Creative Cloud desktop App: https://helpx.adobe.com/in/creative-cloud/help/creative-cloud-updates.html
Thank you for all the feedback. Keep it coming!
-
Jason commented
I can confirm that this is not limited to Windows. This problem exists in MacOS also.
-
Fridrik commented
On Windows 7 and 10 (reproduced on my machine and a colleagues), when OS text scaling is higher than 100%, the dropdownLists in ScriptUI don't work correctly.
See attached, the horizontal and vertical scaling of the dropdown is smaller than the text it's meant to display, leading to options not being shown.
It looks like the UI is being scaled after the dimensions are calculated, and the dropdown is just not updated at all (vertically or horizontally).
This is a bit of an issue because our design team recently got high DPI monitors and they're having to disable UI scaling in illustrator as a workaround but it makes the entire UI tiny.
I've attached a sample script and how screencaps of what they look on my machine (illustrator CS2019, Windows 7)