Updated Python environment can no longer be selected in existing notebooks
I have a python environment("python3") which I recently updated on my automation node, by downloading it as a bundle from the design node, deleting it from the automation node then uploading the new version with the same name - this version update was to upgrade the Pandas base package to version 1.0+.
My recipes work fine, but all existing Jupyter notebooks which used the old environment now show this error when they load:
My updated environment is not available in the list, but it does show up when I create a new notebook.
What has caused it to drop out from these notebooks and how can I get it back?