Line plots with no interpolation

some weeks ago something changed.
I had some line plots with "single points" in diferent color and suddenly I can't sow them anymore.
Here's another example
I have this lines: in yellow

you sow them because of interpolation.
But I only want to see the points, with no interpolation or zero.

Then... they desapeare

it must be a metabase change since I didn't modfied my plots...
any suggestion?