Now that 5.0 is final I have checked and still see the issue you described. I have commented on the above linked issue and hoping to get a reply. Worse yet, there is no recourse from my testing since the option background and text color is not changeable. I will continue observing this issue and looking for workarounds however if nothing shows up I will fallback to a custom select selection to mitigate this issue.
Just wanted to update you with my current status, thanks!