Dropdown floats when scrolling

[AirborneEagle]

Has anyone seen this before?
I didn't find it in existing issues.
GIVEN: I am on a long page with at least one MuiDownshift Component,
WHEN: I focus on the field, and it opens a dropdown
THEN: If I use the mouse scroll wheel to scroll the page, the dropdown maintains its postion on the screen. it should obviously stay with the select input

Click on the field:

then use the scrollwheel to scroll (making sure cursor is not hovering over the drop down):