In lens we have a layout with a flyout with a Drag and Drop are where a Popover can be toggled.
In order to handle automatic close of both flyout and popover there are 2 active EuiOutsideClickDetector which make sure both close on user click.

While the flyout disappear immediately, the popover has a nice fadeout animation which leads to a visual glitch in this scenario (see top left on flyout close), as its parent component gets unmounted before such animation is completed:

Because of this behaviour, the draggable element which is triggering the popover gets still referenced leading beautiful dnd to show a warning + error messages in the console:

I know it's a bit tricky scenarios, but it is currently implemented in Lens.
The only feasible solution found from the EUI outside world would be to wait a bit until the popover animation is completed before closing the flyout, but as suggested in the comment that solution is a bit flacky and it would be better to be addressed at the EUI level.

One proposed solution would be to immediately stop the animation and unmount the popover if it detect the parent component gets unmounted.