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Reproduces with ksh-20120801-26.el7 as well

+++ This bug was initially created as a clone of Bug #1333829 +++

Description of problem:
After updating the ksh package, one of the functions changed its behaviour: Under some circumstances, ksh waits for a command which has been set to run on background to finish as if it was on foreground.

Version-Release number of selected component (if applicable):
ksh-20120801-28.el6_7.3.x86_64

How reproducible:
always

Steps to Reproduce:
1. Run a simple reproducer script
=====
#!/bin/ksh
set -x
function SubJobReel
{
eval "sleep 30" >/dev/null &
echo $!
}

PID=$(SubJobReel)
echo "PID=$PID"
=====
2. yum downgrade ksh-20120801-10.el6.x86_64
3. Run the script again

Actual results:
different behaviour

Expected results:
the same behaviour

Additional info:
In bash any version the script works fine.