Drilldown by clicking charts in Process and Task dashboard is broken

When I clicked parts of charts in Process and Task dashboard it used to do a drilldown on data and focus a subset of data corresponding to a clicked thing (e.g. clicking Pie slice in Process by type corresponding to a process focused only data pertaining to that process).

When I click the charts now, the chart "freezes" (it stops reacting to further clicks) and no
drilldown is performed. Reproduced this this in both firefox and chrome with clean cache.
Browser javascript console shows errors:

chrome: Uncaught TypeError: Cannot read property 'G0' of null
firefox: TypeError: g is null

Interestingly this is only happening in kie-wb > Process and task dashboard, NOT in Contributors perspective or in dashbuilder showcase.

This issue has appeared few days ago and has persisted since then.