PS: In the case that I see 2 of 4 charts rendered, the generated ID is sequential, indicating some kind of timestamp use.
canvasjs-react-chart-container-1654521698465
and
canvasjs-react-chart-container-1654521698466
where new Date(1654521698465) turns out to be Mon Jun 06 2022 15:21:38 GMT+0200 (Central European Summer Time), which is now in my local time. So this is proof that the container IDs are dependent on timestamps.