"Threaded Controllers" issue on cgroup2

General system Kernel, boot, graphics & hardware
1

I just got a problem with creating threaded controllers for cgroup2, is there anyone getting "operation not supported" & "invalid argument" errors at EndeavorOS?

Kernel: 6.1.12-arch1-1

Commands

My Custom Sub-Cgroups : C1 & C2

** root user **

>> findmnt cgroup2
TARGET         SOURCE  FSTYPE  OPTIONS
/sys/fs/cgroup cgroup2 cgroup2 rw,nosuid,nodev,noexec,relatime,nsdelegate,memory_recursiveprot
 
>> cat /sys/fs/cgroup/C1/cgroup.events
populated 0
frozen 0

>> echo "domain threaded" > /sys/fs/cgroup/C1/cgroup.type 
"bash: echo: write error: Invalid argument"

nor

>> echo "threaded" > /sys/fs/cgroup/C1/C2/cgroup.type
"bash: echo: write error: Operation not supported"

nor

>> echo "threaded" > /sys/fs/cgroup/C1/cgroup.type
"bash: echo: write error: Operation not supported"