You can also use another datagrid context menu widget. This one should work.
Hope this solves your problem.
Have you tried this one: https://appstore.home.mendix.com/link/app/3260/Bizzomate/Bizzomate-Datagrid-Context-Menu
I've used it in Mendix 6.10 with chrome and it's working like a charm.
Did you get any answer for your question? I am facing same issue hence asking. Please let me know.