deriv LSK ETT STT aSTA ALPH OLDHOMEPAGE NEWHOMEPAGE
The T ट् in "sIyuT" is a /Tit, the u उ is feop. So the real affix is sIy सीय्.
The s स् of sIy सीय् is lost in the hard liG, because of liGassalop... and other rules.
The y य् of sIy सीय् is lost before consonants by lopovyorvali.
Examples of s स् lost in the bent hard liG —
Examples of s स् kept in the bent soft liG —