nbclassic is currently stuck on 0.3.7, a move to 0.4.0 results in a 404 error on container start. Might be something to do with it redirecting to /tree rather than /lab
upgrading to 0.4.3 gets jupyterlab working, but the openrefine tile vanishes. Will appear if using nb_serverproxy_openrefine, though gives 500.