VSTest@3 fails with FileNotFoundException: Could not load file or assembly ‘System.Collections.Immutable, Version=8.0.0.0

This was a headscratcher which neither AI or Google knew about or could fix for me. At work we have a large monolith with a combination of net48, netstandard and net8 projects. I m upgrading the net8 ones to net10, as net8 is nearing its EOL. When I upgraded the first of our test projects to Continue reading VSTest@3 fails with FileNotFoundException: Could not load file or assembly…