/proc/self/root/proc/thread-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 /.
21 (libuv-worker) S 1 1 1 0 -1 4194624 81 0 0 0 0 3 0 0 20 0 11 0 616 1777893376 40679 18446744073709551615 7589888 50333345 140723160278944 0 0 0 0 16781312 17922 1 0 0 -1 0 0 0 0 0 0 109655528 109844416 508235776 140723160286952 140723160287161 140723160287161 140723160289255 0