Jupyterlab unresponsive when attempting to render random bytes from /dev/urandom

Hi all, wondering if anyone has come across what seems like a rendering issue in JL
it can be recreated by running !head -c 1180000 </dev/urandom in a cell. It seems to be intermittent as well so you may need to run it a few times. The UI becomes unresponsive and I ultimately have to force the tab its running in to close(chrome and ff), server side seems ok, the cell executes and returns to idle almost immediately.