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magick -pointsize 144 -strokewidth 20 -stroke black label:"A" label.png
Oddly enough, some combinations of characters will not crash the IM program, but will leave an incomplete stroke around the characters in the resulting label. As an example, this command...
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magick -pointsize 144 -strokewidth 20 -stroke black label:"TESTING" label.png
Notice the small notch in the mostly lower left corners of each character. I checked some previous work, and it looks like this behavior has been present since at least the last version, IM 7.0.7-33.