• Package version(s): 1.9.0
• Browser and OS versions: All

There are popovers out there that sometimes change size after being initially rendered.
When they do, especially when they change height and are on the side of the element, the arrow gets misaligned. See this example:

Sometimes this change happens instantaneously when a popover gets opened (say <10ms due to multiple render cycles being needed), sometimes it happens after some time (say >1000ms due to an async call completing perhaps).Probably worth keeping that in mind for animation reasons.