I have a rooted aosp device (Nokia XL) and I noticed that I have these two binaries under /system/xbin

-rwxr-xr-x 1 0 0 199170 Sep 25 10:14 scp
-rwxr-xr-x 1 0 0 1050086 Sep 25 10:14 ssh

It would seem that I could use ssh/scp from the command line (I also have connectbot+busybox installed), but no. If I try to execute ssh, all I get is sh: ssh: No such file or directory. The /system/xbin directory is in the PATH and I also can't execute ssh with /system/xbin/ssh command. How is this even possible???

I do have dropbear ssh/sshd/sftp-server installed under /data/dropbear, the binaries under that directory work just fine. My question is where did the non-functional binaries under /system/xbin come from and do they actually serve some purpose? What happens if I delete them or chmod a-x them? Is this some weird SELinux thing or something like that?

Any help is appreciated, thanks