Android : Failed to attach: unable to connect to remote frida-server: closed

Question

I'm trying to bypass Frida (Android) local port scanning detection, so I followed this guide. The sequence of commands I used are : (magic_man is alias for frida_server)

adb root
adb push magic_man /data/local/tmp/
adb shell "chmod 755 /data/local/tmp/magic_man"
adb shell "/data/local/tmp/magic_man --listen=unix:/data/local/tmp/magic_socket &"
adb forward tcp:27042 localabstract:/data/local/tmp/magic_socket

Now I'm using a Custom ROM (close to AOSP), it isn't rooted but I can enable root access for ADB only.

So, what I noticed after running these commands the checking ls -l inside /data/local/tmp that magic_socket is not created. and if I run simple trace commands like frida-trace -U -i open YouTube , it shows me :

Failed to attach: unable to connect to remote frida-server: closed

If I just use the below command, frida-trace is working correctly. But then the app is able to detect frida.

adb shell "/data/local/tmp/magic_man &"

What am I doing wrong here? Or is there any other way to do the same? the docs of frida look incomplete and outdated.

Update :

I installed another ROM (A13 - FireDroid) with KernelSU enabled, this time unix port was created and I was able to connect to it, but the problem appeared was that it was launching apps when using -f command, unlike before but I was getting error that spawn is failed while the app was being launched.

Is there any way to debug/figure out what exactly is going on?