With IM 6.9.9-43 running this command...
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convert -stroke black label:"X X" test.png
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convert.exe: non-conforming drawing primitive definition `path' @ error/draw.c/DrawImage/4073.
The same command with IM 7.0.7-33 "magick"...
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magick -stroke black label:"X X" test.png
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magick: non-conforming drawing primitive definition `path' @ error/draw.c/DrawImage/4205.
It requires a space in the label text to cause these errors, like "X X".
It doesn't seem to matter what color is designated for the "-stroke".