It's a very workflow-specific bug. I pretty much only encounter it while playing video games.

Turns out that while gaming I often have a Youtube video playing in one browser tab, and use another browser tab to look up game-related information. So it is really common for me to interact with the tab bar (which triggers the tooltip) right before alt-tabbing into my game.

During day-to-day browser use my cursor is almost always located somewhere over the website content - which rarely triggers a tooltip.