Yes, rs2 != is2.

st.info

@@ -166,7 +166,7 @@ st| simpleterm,
 	rmso=\E[27m,
 	rmul=\E[m,
 	rs1=\Ec,
-	is2=\E[4l\E>\E[?1034l,
+	rs2=\E[4l\E>\E[?1034l,
 	sc=\E7,
 	setab=\E[4%p1%dm,
 	setaf=\E[3%p1%dm,