Tooltips are not displayed in dashboard

[alexmeia]

When the visual is pinned to a dashboard tooltips are not displayed on mouse over, while native visuals can display their tooltips correctly.
In all other contexts (included dashboard in focus mode) tooltips work as expected.
Debugging the code I noticed that the method visualhosttooltipservice.show() is called as usual in tooltipServiceWrapper.ts, but nothing is shown.