"Save and Export Notebook as" is not working

[imerelli]

Hi, starting from this configuration

pip list | grep jupy
fps_jupyterlab                    0.6.3
jupyter_client                    8.6.3
jupyter-collaboration             3.0.0b6
jupyter-collaboration-ui          1.0.0b6
jupyter_core                      5.7.2
jupyter-docprovider               1.0.0b6
jupyter-events                    0.10.0
jupyter-lsp                       2.2.5
jupyter_server                    2.14.2
jupyter_server_fileid             0.9.3
jupyter_server_terminals          0.5.3
jupyter-server-ydoc               1.0.0b6
jupyter-ydoc                      3.0.0a8
jupyterlab                        4.2.5
jupyterlab_pygments               0.3.0
jupyterlab_server                 2.27.3
jupyterlab_widgets                3.0.13
jupyverse                         0.6.3
jupyverse_api                     0.6.3
lckr_jupyterlab_variableinspector 3.2.4

I have problems with the File -> Save and Export Notebook as function. Here is a screenshot:

This happens always for the pdf related saving options, but also saving using the other formats results in strange behaviours.

[davidbrochart]

This also happens with jupyter-server. It's caused by the RTC: prefix added by jupyter-collaboration. There are a number of efforts that will allow to get rid of this:

• Add content providers jupyterlab/jupyterlab#16744
• Allow customizing the ServiceManager with plugins jupyterlab/jupyterlab#16794