yes it seems conflict, @smu44 knows better than me.
i have corrected my post, i propose to use TWRP GUI to mount, and first copy your file from /system to /external_sd, then modify, and finally copy/move to /system (that is replacing).
or use adb shell pull / push
you may have to change files rights
like in this exemple Xiaomi, faut-il rebloquer le bootloader - #3 by saroumane38