Pass errorlevel from a child batch to parent

Parent .bat

@echo off
SETLOCAL

set errorlevel=2

start /wait child.bat
echo %errorlevel%

Child .bat

set errorlevel=1
exit %errorlevel%

Output:

2

Expected Output:

1

The answer provided here does not work for me, also I don't understand why you would use /b and leave the cmd open.

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