Because the Aakar font is part of the fonts-gujr-extra package.
To re-phrase the problem: On certain text input, the Aakar font emits a reset 
command to the printer.
In contrast, other non-Latin fonts (e.g. STZhongsong) when presented with Latin 
characters gracefully degrade to a default Latin font. Alternatively, it could 
be replaced in the output by a "unknown character" symbol, there is even a 
Unicode code point for that: U+FFFD � REPLACEMENT CHARACTER used to replace an 
unknown, unrecognized or unrepresentable character. That would give a visible 
clue to the location of the user's mistake.

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https://bugs.launchpad.net/bugs/1832222

Title:
  using aakar font reboots printer

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