so there was bug with latest version, so we recently updated to version 10.3.2 and found the issue with tooltip --> positioner function.
below is the link
https://jsfiddle.net/vgx290ha/
when you hover over chart.. you will see error below on console.
Error: <g> attribute transform: Expected number, "translate(NaN,0)"
if you comment the positioner function.. then error is gone.
this function was working fine with 10.2.0 version.. is there anything changed around that or this is also a bug ?
Thanks