could not load file or assembly the located assembly's manifest definition does not match the assembly reference

I updated our WebView2 version to the latest but I have one project still complaining about missing the old version assembly. My solution builds fine, but complains when I attempt to debug it.

I've verified:

1. All .csproj files reference the correct version
2. Nuget Package Manager shows correct version installed on projects
3. Correct .dll is referenced in the build output
4. Closed / Reopened VS (2019)
5. Cleaned / Rebuilt Solution