So you have tried the default play test without upgraded nw.js? That is quite Strange because I don't have this problem. Do you test it on the same computer?
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For sure! Appreciate you taking a look. I think what I figured out is that, at my 320x180 game resolution and 1x font scale, the bug appears. But on a new project with the font at 2x scale, the bug is not there. Anywho, here's a link to my project: https://cilerba.com/fontbug.zip
Got it. You can edit line 646 of the plugin, change 17 to something bigger for example 18, should fix your problem.
for (let i = 0; i < 18; i++) { //dummy commands, fix gpu glitchThis problem should also be gone if you upgrade nw.js to the newest version. Seems to be a glitch of the browser when drawing very small shapes.