I haven't seen the examples since my tablet refuses to display them, but I wonder if you have run into a difference between Hindi and Marathi typography. The repha in Marathi is sometimes represented as a slightly curved stroke between two letters. Googling "eyelash repha" I found this:

http://unicode.org/~emuller/iwg/p8/utcdoc.html

Den fre 19 okt 2018 13:30Ulrike Fischer <news3@nililand.de> skrev:
Am Fri, 19 Oct 2018 11:36:48 +0200 schrieb Arthur Reutenauer:

>> Screenshots and code that show the difference and the missing accent
>> in the xelatex and context output are in this comment

>> https://github.com/u-fischer/luaotfload/issues/9#issuecomment-431288932

>> the older (perfect) output is in a comment above
>> https://github.com/u-fischer/luaotfload/issues/9#issuecomment-426978522
>
>   The missing “accent” is a repha, a form of the consonant ra.  It seems
> to have been replaced by a middle dot, to the right of the base
> consonant.  I can’t be completely sure because it’s protruding into the
> next consonant so it’s almost indistinguishable from it, but I think
> that’s what happened.

Yes, good catch. there is a dot. But I'm wondering if I saw ghosts
when thinking that it worked before. I can't find no commit which
changes to the "right" output and also in a older context it is
wrong.



--
Ulrike Fischer
http://www.troubleshooting-tex.de/

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