The Assamese 'reph' and 'rakaar' are not properly rendered while using the Assamese font "Banikanta", a font released by Govt. of Assam in India. The font can be downloaded from http://www.publicationboardassam.com/wp-content/uploads/2021/02/Banikanta.zip

The font works well in all the other tools and platforms including MS-Word, Libre office etc.

Being associated with the development of this font, I have seen that the issue is seen due to the problem of the improper rendering of Adobe InDesign. In this font we have skipped the mapping of Bengali "Ra" (U+09B0) to construct the 'reph' and 'rakaar" as it is not used in Assamese and instead used the Assamese "Ra"(U+09F0). But even when Assamese “Ra” is typed to form the “reph” or “rakaar”, Indesign converts it to Bengali ‘Ra” and since we have not mapped the Bengali “Ra” to “Reph” and “Rakaar”, it doesn’t not display in the desired form.

Moreover, there is another problem. When U+09AF BENGALI LETTER YA (antaḥstha za) occurs as the last member of a consonant cluster it has a special shape called ya-phalā. But in Assamese ya-phalā shape should occur only when U+09DF (Yya) occurs as the last member of a consonant cluster. The font has this provision, but Adobe InDesign fails to render it correctly.

The problem can be reproduced in Adobe InDesign CS6 (Version 8.0)