Comma character "," disappears in dash table

I do have dataframes that can contain a list in a cell, e.g. [2016,2017].

However, the content per cell is rendered as “20162017”. Is there a way to give the join-string-character? So I could achieve “2016, 2017”?

When hovering the mouse over such data entries, the comma is actually still shown and filtering the column also requires specifying the comma for intended results.