If you will release a new, better, version but without a feature I like, I might come back and contribute it again.
If you release a new broken version, I may not be able to convince stakeholders to engage and come back, the trust in the project will be lost.

I think I tracked it down and Zach contributed this :) Thank you!

I'm really curious what is on the contributions slides. Is this a specific repo/subproject? How was it generated?

To install from PyPI:

pip install --pre --upgrade jupyterlab==4.5.0rc0

You can also install the RC from conda-forge (anaconda.org/conda-forge/...).

Thank you to Rosio Reyes for compiling the release notes, and thank you to everyone who contributed!