There is no 8bit by default and reset 8bit too.

st.info

@@ -47,7 +47,7 @@ st| simpleterm,
 	ind=^J,
 	indn=\E[%p1%dS,
 	invis=\E[8m,
-	is2=\E[4l\E>,
+	is2=\E[4l\E>\E[?1034l,
 	it#8,
 	kel=\E[1;2F,
 	ked=\E[1;5F,
@@ -147,7 +147,6 @@ st| simpleterm,
 	kich1=\E[2~,
 	knp=\E[6~,
 	kmous=\E[M,
-	km,
 	kpp=\E[5~,
 	lines#24,
 	mir,
@@ -167,7 +166,7 @@ st| simpleterm,
 	rmso=\E[27m,
 	rmul=\E[m,
 	rs1=\Ec,
-	rs2=\E[4l\E>,
+	is2=\E[4l\E>\E[?1034l,
 	sc=\E7,
 	setab=\E[4%p1%dm,
 	setaf=\E[3%p1%dm,