Press Ctrl + Y to view the artwork in Outline mode
with the direct selection tool, select the line between the anchor points and delete it, then redraw the the line with the pen tool
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it has been an issue with that font for ages, there is an internal issue with the font character map.
try to find a replacement to that font in OTF format
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you only have to check this option if you want to embed all Linked file into the AI file,
if it is off, that means that document difenitly contains no linked files.
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Do you have an active internet connection ? does that happen in illustrator or in other adobe Apps ?
if yes, Have you tried restarting the App ? Sign out from Creative cloud ?
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