Break statement of bash cannot be defined in a function from bash-4.4

Issue

• There is test shell using break statement in a function. It could be executed in RHEL7 normally but failed in RHEL8 and RHEL9.

  # cat test.sh
  #!/bin/bash
  
  while true;do
    printf "job start\n"
  
    function testBreak(){
        printf "function start\n"
        break
    }
  
    testBreak
  done
  

• Test result in RHEL7.

  # rpm -q bash
  bash-4.2.46-35.el7_9.x86_64
  # ./test.sh
  job start
  function start
  

• Test result in RHEL8 and RHEL9.

  # rpm -q bash
  bash-4.4.20-5.el8.x86_64
  # ./test.sh
  job start
  function start
  ./test.sh: line 8: break: only meaningful in a 'for', 'while', or 'until' loop
  job start
  function start
  ./test.sh: line 8: break: only meaningful in a 'for', 'while', or 'until' loop
  ...