Radzen Blazor (Server) Toolip strange behaviour

Having followed the Radzen Tooltip documentation, I am seeing a strange tooltip behaviour. After page load, when I first mouse over the tooltipped page element, nothing appears, no matter how long the mouse remains over. I mouse out, then mouseover again and the tooltip correctly appears, and appears/disappears correctly each time after that.

Any idea why the "only fails first time" could occur?

I’m unable to reproduce such behaviour on our demos and since I’ve never seen it before I can’t comment.