When you have Minecraft in a small window, showing the hotkeys can make 2 rows of buttons, like this:

Let's say I want to open the Player Overview from here. I click on the Player Overview button and... nothing. It moved the cursor on the Keyframe Timeline to the position of the mouse cursor, totally ignoring the Player Overview button, same thing for any buttons unless there's no clickable things under them (like buttons or timelines).

Don't think this is worth fixing as it still leaves the issue of buttons going out of bounds which is more severe. Will probably just go with #469 to fix both.