Why can't i see a mounted folder into my file explorer, but i can see it from a terminal?

I'm mounting a folder (/mnt/sdcard/Source) into other folder (/mnt/sdcard/Destination) with the next command (requieres Root permissions):

mount -o bind /mnt/sdcard/Source /mnt/sdcard/Destination

If i check with the ls command, i can see the files, but not on my explorer.

I'm testing it on a Moto G running Android 4.4.2 (Kitkat), but the same command works fine on Android 4.2.2 (Jelly Bean).

Why can't i see a mounted folder into my file explorer (checked ES file explorer and RootBrowser) , but i can see it from a terminal?

I'm mounting a folder (/mnt/sdcard/Source) into other folder (/mnt/sdcard/Destination) with the next command (requieres Root permissions):

mount -o bind /mnt/sdcard/Source /mnt/sdcard/Destination

If i check with the ls command, i can see the files, but not on my explorer.

I'm testing it on a Moto G running Android 4.4.2 (Kitkat), but the same command works fine on Android 4.2.2 (Jelly Bean).