Hot Reload fails when project code class that derives from a plugin code class is modified

Hot Reloading fails in 4.21 if a project code class that derives from a plugin code class is modified. The Editor appears to be looking for a corresponding Hot Reload .dll for the plugin, even though the plugin is not being updated.

REGRESSION:
Yes. A Hot Reload in this instance would complete successfully in 4.20.3

1. Create a new Basic Code project.
2. Add a new Blank plugin to the project.
3. Add a new Pawn code class to the plugin.
4. Add a new code class to the project that derives from the new Pawn class in the previous step.
5. With the Editor open, add a variable to the code class created in the previous step.
6. Right-click on the project in Visual Studio and click Build in order to start a Hot Reload.

RESULT:
The Hot Reload fails with an error similar to the following: Missing import: UE4Editor-MyPlugin-3343.dll

EXPECTED:
The Hot Reload completes successfully.