Pre Launch command exit code 0 (ARM64)

[JJTech0130]

System Information

MultiMC version: 0.6.9-custom (no source code changes, using custom build for ARM64 - https://github.com/JJTech0130/MultiMC5/releases/tag/build-20)

Operating System: Ubuntu with KDE ARM64

NOTE: To make multiMC use ARM64 LWJGL I made (https://github.com/JJTech0130/MultiMC-Patcher)

Summary of the issue or suggestion:

MultiMC incorrectly detects the pre launch command as exiting with error code 0.
Why does it think 0 is an error? 0 is supposed to be success.
I cant copy the command from the log (~/MultiMC/patches/runpatcher.sh 1.9.4) and it correctly patches it, and then I can remove it from the pre launch command and minecraft runs succesfully.
I even made a wrapper for it to guarantee succesfull exit code (that is why it is runpatcher.sh not patcher.sh - runpatcher.sh is just a wrapper)
Also - MutiMC incorrectly states all my java versions are 32 bit - they are not. java -version reports 64bit.

What should happen:

MultiMC should run the command and then proceed to launch minecraft.

Steps to reproduce the issue (Add more if needed):

1. Dowload and install MultiMC from https://github.com/JJTech0130/MultiMC5 on an ARM64 OS/ build MultiMC from source on ARM64 --- I used a raspberry pi 4 with kubuntu

2. Install MultiMC-patcher from https://github.com/JJTech0130/MultiMC-Patcher to MultiMC/patches and add ~/MultiMC/patches/patcher.sh $INST_ID as a pre launch command

3. Launch Minecraft

Suspected cause:

It is probably something about bash/ detecting error codes on ARM64

Logs/Screenshots:

https://paste.ee/p/rEt6B

Additional Info:

I compiled MultiMC with Jenkins on Debian ARM64 on an RPi3 (It is a private server)

[JJTech0130]

Apparently, you first need to make sure it is executable and second you need to close MultiMC and relaunch after setting the prelaunch command