Jupyterlab cell output issue

I just discovered steamz and think it looks great. However, when I try to run some of the sample code in a Jupyterlab notebook, I experience some strange behavior where the I sometimes get output of "Output()" and then, when running a subsequent cell, get the output of the previous cell. This only happens in Jupyterlab not a Jupyter notebook.

Here are some package versions installed:

anaconda-client==1.7.2 anaconda-navigator==1.9.7 anaconda-project==0.8.3 dask==2.5.2 dask-labextension==1.1.0 ipywidgets==7.5.1 jupyter==1.0.0 jupyter-client==6.0.0 jupyter-console==6.0.0 jupyter-core==4.6.3 jupyter-server-proxy==1.2.0 jupyterlab==2.0.0 jupyterlab-server==1.0.6 nbconvert==5.6.0 nbformat==4.4.0 notebook==6.0.3 streamz==0.5.2 toolz==0.10.0 tornado==6.0.3 widgetsnbextension==3.5.1

Any thoughts?

(I also had the same behavior using the docker container PR)

All on a mac with Mojave 10.14

Hah, that is not ideal. If this works in classic notebook, that is a bit confusing... I don't know when I can investigate.