oksh not compliant with ksh88 vi-editing mode?

[kajukenbo]

I have tested oksh on a couple of OpenBSD systems as well as this port on Debian (Devuan) and I am having a problem.
I am wondering if it is user error. I thought I might ask here before heading upstream.

Example:

$ oksh

$ set -o vi ; set -o viraw ; set -o posix

$ for I in a b c

do
echo $I
done
a
b
c

So far so good, but:

^[k
$ done

This behavior is unusual, per ksh88, ksh93, and each "commercial POSIX" implementation I have noticed (AIX, HP-UX).
oksh is actually similar to the way GNU Bash works in this case.

$ fc -l
1 set -o vi ; set -o viraw ; set -o posix
2 for I in a b c
3 do
4 echo $I
5 done

Notice how the for loop in history is "split"; each command is on 1 line instead of together.

Compare to the common/classic behavior:

$ for I in a b c

do
echo $I
done
a
b
c

^[k
$ for I in a b c^Jdo^Jecho $I^Jdone

This allows direct command editing and execution of the entire loop within vi, by pressing "v".

$ fc -l
1 set -o vi ; set -o viraw ; set -o posix
2 for I in a b c
do
echo $I
done

Is this "splitting" the "expected" behavior in oksh? If so, is there a way to get the "classic" behavior of ksh88's vi-mode or should I just use a different shell?

Thanks