There is no composition rule for \u09F0 (ৰ) and \u09FE (৾) in emacs, therefore they are not rendered properly.
Steps to reproduce:
1. emacs -Q
2. Type:
ৰাম কৰ্ম ৰূপ
লা৾নু না৾
The following patch will fix the problem:
diff --git a/lisp/language/indian.el b/lisp/language/indian.el
index b240403b0a..b6fcdbb348 100644
--- a/lisp/language/indian.el
+++ b/lisp/language/indian.el
@@ -194,13 +194,14 @@ bengali-composable-pattern
'(("a" . "\u0981") ; SIGN CANDRABINDU
("A" . "[\u0982\u0983]") ; SIGN ANUSVARA .. VISARGA
("V" . "[\u0985-\u0994\u09E0\u09E1]") ; independent vowel
- ("C" . "[\u0995-\u09B9\u09DC-\u09DF\u09F1]") ; consonant
+ ("C" . "[\u0995-\u09B9\u09DC-\u09DF\u09F0\u09F1]") ; consonant
("B" . "[\u09AC\u09AF\u09B0\u09F0]") ; BA, YA, RA
("R" . "[\u09B0\u09F0]") ; RA
("n" . "\u09BC") ; NUKTA
("v" . "[\u09BE-\u09CC\u09D7\u09E2\u09E3]") ; vowel sign
("H" . "\u09CD") ; HALANT
("T" . "\u09CE") ; KHANDA TA
+ ("S" . "\u09FE") ; SANDHI MARK
("N" . "\u200C") ; ZWNJ
("J" . "\u200D") ; ZWJ
("X" . "[\u0980-\u09FF]")))) ; all coverage
@@ -209,7 +210,7 @@ bengali-composable-pattern
;; syllables with an independent vowel, or
"\\(?:RH\\)?Vn?\\(?:J?HB\\)?v*n?a?A?\\|"
;; consonant-based syllables, or
- "Cn?\\(?:J?HJ?Cn?\\)*\\(?:H[NJ]?\\|v*[NJ]?v?a?A?\\)\\|"
+ "Cn?\\(?:J?HJ?Cn?\\)*\\(?:H[NJ]?\\|v*[NJ]?v?a?A?S?\\)\\|"
;; another syllables with an independent vowel, or
"\\(?:RH\\)?T\\|"
;; special consonant form, or