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On any of the dropdown boxes in the Text Editor area (for example selecting the name of a function declared in the code you are editing), if the box scrolls the cursor is off by more than half a step and it makes it hard to actually select an item in the list... you'll usually end up either selecting the item before or after the one you are actually going for.
Can you make a screencast ?
I've had the same problem for some time since the release of the IDE back in Feb. I reported it once but can't find the old bug report.
It appears the combo box is forcing the display to show only complete text lines but the current scroll position is actually at a partial line position. The code that determines which line is being pointed at is using the real scroll position instead of the 'rounded down' position used to determine where to draw the text.
To test, you have to get the scroll position somewhere in the middle. At the start or end will always work correctly. The amount of roundoff error will vary with different scroll positions.
As a separate issue, the combobox used to be much larger but was changed to just 8 lines of text with the big UI update. See screenshot
Created attachment 4245 [details]
Screenshot showing error in scroll position