This doesn’t make sense and I cannot understand why this doesn’t work.

The following batch script works well and prints the following output
ABC
function_result=123

@echo off
setlocal

set "version_1=3.11.5"

if "%version_1%"=="3.11.5" (
    echo ABC
)

call :MyFunction
set "function_result=%errorlevel%"
echo function_result=%function_result%

endlocal
exit /b 0
pause


:MyFunction
set "a=123"
exit /b %a%

However, if you move the funtion call (the 3 lines) into the if-clause then the output is
ABC
function_result=

As you can see the function result is nothing.

if "%version_1%"=="3.11.5" (
    echo ABC
    call :MyFunction
    set "function_result=%errorlevel%"
    echo function_result=%function_result%
)

Can anyone please help with this, since I need to call the function from within a condition clause?