missing stone at first rendering

[arkanovicz]

Hi Joonas. I integrated jgoboard-3 (up-to-date master branch) on the problems playing page of internetgoschool.com, and we have some users reporting that from times to times, there is a stone missing (one time out of ten typically). The problem disappear after a refresh (maybe it's the same probability). We use a css scaling transformation on the canvas, but it shouldn't be an issue. It happens on both Chrome and Firefox recent versions. Does it evoke something to you? Do you have an idea about a probable cause? Many thanks. Regards, Claude