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Fix layout #11486
Regarding this comment, popovers do not belong to the UI kit and should be removed.
For information, I don't think that this behavior is really a bug, but Bootstrap's intended behavior coupled with an edge case. As you can see in this screencap from Bootstrap's source code, popovers have a higher z-index than modals, which means they are supposed to be displayed above them:
I can only guess about the reasoning behind it. My take is that:
Why are they sticky? Because dismissable popovers don't work for the element we use them on.