l noticed that the underscores disappear or become cut when increasing the font size to specific values.

When putting solely underscores in a line, they are invisible. When a space or some letter is added to the line, the underscores are slightly visible. l use sub-pixel-geometry, thus that the slightly visible underscore is green means it's the top part and the lower pixels (or whatsoever) are cut.
line 934: 3 underscores, 1 space
line 935: 3 underscores

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