cpu/online file is duplicated

[alex14641]

# lxcfs -o allow_other -l /var/lib/lxcfs >& /tmp/lxcfs.log &
# ls -l /var/lib/lxcfs/sys/devices/system/cpu/online* 
-r--r--r-- 1 root root 5 Jul 30 19:27 /var/lib/lxcfs/sys/devices/system/cpu/online
-r--r--r-- 1 root root 5 Jul 30 19:27 /var/lib/lxcfs/sys/devices/system/cpu/online
# ls -l /var/lib/lxcfs/sys/devices/system/cpu/online
-r--r--r-- 1 root root 5 Jul 30 19:27 /var/lib/lxcfs/sys/devices/system/cpu/online

I'm using Slackware-current with glibc-2.42 and cgroups v2 and kernel 6.12.40.