QPainter::drawText() cuts off characters from the back and the front of the word at large font sizes

I have an app that draws Hebrew text (I haven't confirmed yet if the bug also shows up with other scripts) using QPainter::drawText(). When drawing the text with a large font size, at certain (apparently random) large font sizes, the drawText() function doesn't draw some of the (whole) characters at the beginning or the end of the word. I'll try to reproduce a minimal example and report on my findings.