On exit ksh kills all the processes running in the session, including processes started using "nohup"

Issue

• Starting processes using nohup doesn't prevent ksh from killing them when the session exits, as shown in the example below

  $ cat test.sh                                                                                                                
  #!/bin/sh
  watch -n 30 tail -f $0
  
  $ nohup ./test.sh &                                                                                                          
  [1] 2233
  nohup: ignoring input and appending output to 'nohup.out'
  $ exit
  You have running jobs
  $ exit
  
  --> "watch" and "tail" processes are dead
  

• Exiting the shell requires typing "exit" twice and ksh complains with message "You are running jobs"