Script crashes after "Remounting /system..."

For me script crashes on "Remounting /system..." step

MENU

    1 - Patch file from a device (adb)
    2 - Patch file from the input folder

> 1

 *** OS: Linux 4.14.9-1-ARCH (linux)
 *** Python: 3.6.4 (64 bit)
 *** Mode: 1
 *** Working dir: /tmp/Tingle-x2vr8_to
 *** Selected device: 43f8c4790903
 *** Automounting /system...
      DEBUG: Already mounted
 *** Pulling framework from device...
 *** Device SDK: 25
 *** Decompressing framework...
      DEBUG: Decompressing framework.jar
 *** Disassembling classes...
      DEBUG: Disassembling framework/classes.dex
 *** Patching...
 *** Detected: Android 8.x / 7.x / 6.x (or LOS/CM 13-15)
 *** Patching succeeded.
 *** Reassembling classes...
      DEBUG: Assembling out/classes.dex
      WARNING: The reassembling has failed (probably we have exceeded the 64K methods limit)
               but do NOT worry, we will retry.
 *** Moving methods...
      WARNING: Experimental code.
      DEBUG: Disassembling framework/classes2.dex
 *** Reassembling classes...
      DEBUG: Assembling out/classes.dex
      DEBUG: Assembling out/classes2.dex
 *** Recompressing framework...
      DEBUG: Compressing framework.jar
 *** Copying the patched file to the output folder...
 *** Rooting adbd...
      DEBUG: adbd cannot run as root in production builds
 *** Unlocked ADB: False
 *** Remounting /system...

ERROR INFO
==========
Type: <class 'subprocess.CalledProcessError'>
Cmd: ['/usr/bin/adb', '-s', '43f8c4790903', 'shell', "su -c 'mount -o remount,rw /system /system && mount' | grep ' /system '"]
Return code: 1
Output: mount: '/system' not in /proc/mounts

Traceback (most recent call last):
  File "./main.py", line 720, in <module>
    enable_device_writing(SELECTED_DEVICE)
  File "./main.py", line 365, in enable_device_writing
    remount_check = safe_output_decode(safe_subprocess_run([DEPS_PATH["adb"], "-s", chosen_device, "shell", "su -c 'mount -o remount,rw /system /system && mount' | grep ' /system '"]))  # Untested
  File "./main.py", line 203, in safe_subprocess_run
    return subprocess.check_output(command, stderr=subprocess.STDOUT)
  File "/usr/lib/python3.6/subprocess.py", line 336, in check_output
    **kwargs).stdout
  File "/usr/lib/python3.6/subprocess.py", line 418, in run
    output=stdout, stderr=stderr)
subprocess.CalledProcessError: Command '['/usr/bin/adb', '-s', '43f8c4790903', 'shell', "su -c 'mount -o remount,rw /system /system && mount' | grep ' /system '"]' returned non-zero exit status 1.
                                        

Phone is Xiaomi Redmi Note 4X running AospExtented v4.6/Android 7.1.2, rooted via Magisk if it makes the difference.

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