https://mattfrear.com/2026/05/07/vstest3-fails-with-filenotfoundexception-could-not-load-file-or-assembly-system-collections-immutable-version8-0-0-0/Matt's work blogen2026-05-07T01:23:22+00:00VSTest@3 fails with FileNotFoundException: Could not load file or assembly ‘System.Collections.Immutable, Version=8.0.0.0