Closes #4046

Rubberduck.VBEditor.VB6/SafeComWrappers/VB/VBProject.cs

@@ -1,5 +1,6 @@
 using System;
 using System.Collections.Generic;
+using System.Diagnostics;
 using System.Linq;
 using System.Runtime.InteropServices;
 using System.Text.RegularExpressions;
@@ -63,7 +64,21 @@ public EnvironmentMode Mode
                     return 0;
                 }
 
-                return (EnvironmentMode) EbMode();
+                // Note - the value returned by the EbMode function does NOT match with the EbMode enum, hence remapped below.
+                var ebMode = EbMode();
+                switch (ebMode)
+                {
+                    case 0:
+                        return EnvironmentMode.Design;
+                    case 1:
+                        return EnvironmentMode.Run;
+                    case 2:
+                        return EnvironmentMode.Break;
+                }
+
+                // Should never get here
+                Debug.Assert(false, $"Unexpected value '{ebMode}' returned from EbMode");
+                return EnvironmentMode.Design;
             }
         }