ArcGIS Pro 2.8.1 keeps changing Python environment back to default

[Joshua-Young]

After installing the patch for ArcGIS Pro 2.8.1, every time I launch an ArcGIS Pro project that has an existing Python Notebook the active Python environment changes back to arcgispro-py3. The only thing that changed was installing the 2.8.1 patch. I have tried reinstalling ArcGIS Pro and cloning to different locations, but as soon as I open that notebook the active environment changes back to arcgispro-py3.

The notebook previously used a cloned environment with no issues.

[Joshua-Young]

The issue is fixed for me at 2.8.2. However, at least on ArcGIS Pro 2.8.2, do not upgrade the pandas package above version 1.2.3. Any pandas version higher than 1.2.3 causes the arcgis package to fail upgrading from 1.8.5 to 1.9.0. If arcgis 1.9.0 is already installed then every Notebook will throw an error in ArcGIS Pro when you try to run the Notebook, until you roll pandas back to 1.2.3.