I’ve seen this issue myself, trying to use it to draw a line graph. Its AA related as didn’t occur with antialiasing disabled but also really ugly and not a solution.
Seems to mostly occur if the line is close to another line (AA Zorder fighting perhaps?). Doesn’t seem to occur if you draw all the lines using “Draw Line” and loop through it. Only “Draw Lines” it showed up for me, though guessing would loose quite a lot of performance benefit if you don’t batch it.
Attached a sample project that shows it, red line is using “Draw Line” looped, blue line is “Draw Lines”. would like this fixed and could use it for line graphs and that could end up drawing a lot of lines that the performance benefit would be worth it.
Thanks,
p.s. excuse the mess in the BP only a 2min setup so not neat but shows whats needed 