I reported this before when I saw it on a mobil, but I just found similar on a Windows 11 PC running the latest Chrome. When I hover over row numbers, the hover class remains even after the hover exit (see attached).
In the demo page, the first demo change:
numberCell: {
show: true
},
and add:
hoverMode: "cell",
I used Cupertino theme. Hover over the numbers and when hover ends, the class remains.
On mobile (Android), I was getting the same but hoverMode:"row"