Lohit Tamil font club letter ஶ்ரீ not appearing for ஶ் + ரீ . Lohit Tamil Classical font clubs as ஶ்ரீ correctly

[Oppili]

Unicode 5.1 has a named sequence for the Tamil ligature SRI (śrī), ஶ்ரீ. The name of this sequence is TAMIL SYLLABLE SHRII and is composed of the Unicode sequence U+0BB6 U+0BCD U+0BB0 U+0BC0.

ஶ் (0BB6 + 0BCD) + ரீ (0BB0 + 0BC0) = ஶ்ரீ

https://en.wikipedia.org/wiki/Tamil_script See syllabary para in the above link.

This clubbing of letters not happening for letter ஶ்ரீ in Lohit Tamil Font.

Lohit Tamil Font is released by Red Hat and Lohit-Tamil.ttf file downloaded from their site and installed renders the clubbed letter correctly.

Red Hat Lohit Tamil Font --> https://releases.pagure.org/lohit/