Due to my mistake, I had overlooked the composition rules for the nasal
vowels for the scripts which I had added.
Therefore I have attached a patch which will fix the problem.
Even though I did not notice the problem with the kaithi script, I have
added the rule to that too.
I have also renamed "anusvara-candrabindu" as "nasal".

Steps to reproduce:
1. emacs -Q
2. Type:
     𑒅𑒿 𑒆𑓀
     𑆅𑇏 𑆏𑇏