Why hovering over a line dot doesn't show the value?

I think it does show the values with simple questions but when I created a line using SQL code it doesn’s show the values when hovering over dots.

Update: for some reason when I select date format as ‘YYYY-MM’ it doesn’t show values on hover but when I changed it to ‘YY-MM’ it works just fine.

Hi @tautvydas.valatka
I have reproduced the problem and created an issue: