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From: Eli Zaretskii <eliz@gnu.org>
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Subject: Re: Incorrect glyph info in describe-char
Date: Fri, 23 Jul 2021 13:25:58 +0300
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To: Anand Tamariya <atamariya@gmail.com>
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 (message from Anand Tamariya on Fri, 23 Jul 2021 13:45:23 +0530)
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> From: Anand Tamariya <atamariya@gmail.com>
> Date: Fri, 23 Jul 2021 13:45:23 +0530
> Cc: emacs-devel@gnu.org
> 
> My bad. I mixed up the test. After applying the text property on SHIN, the result is:
> (10 13 [[#<font-object "-PfEd-DejaVu Sans-bold-oblique-normal-*-78-*-*-*-*-0-iso10646-1"> 1513 1473
> 1464] 63 [0 2 1464 1305 0 8 35 0 17 nil] [0 2 1473 1314 0 63 73 56 -48 nil] [0 2 1513 1344 58 6 67 43 0 nil]]) 

Ah.  So the problem is somewhere inside find_automatic_composition or
the functions it calls.  If you can step through that code with GDB,
please do (I'll provide instructions if you need them).  Failing that,
someone who can reproduce the problem would need to see what happens
in there; I cannot reproduce the issue with the fonts I have here.