/proc/self/root/proc/self
This explorer reads the filesystem of the server it runs on, so /workspace/user isn't present here. Browsing and the terminal still work against this server's own disk from /.
[<0>] syscall_exit_to_user_mode+0x57/0xe0[<0>] do_syscall_64+0x57/0x110[<0>] entry_SYSCALL_64_after_hwframe+0x76/0x7e