Describe the bug
Right click and show implementations on a specific getter, and the in-line dialog shows obviously implausible suggestions. The feature works most of the time so I'm not sure what set of conditions is causing this. IntelliJ's plugin seems to give good results here, so to start with, filing with the VSCode plugin.

To Reproduce
Steps to reproduce the behavior:

1. git clone git@github.com:dart-lang/dartdoc.git
2. cd dartdoc && git checkout e8c5de44294d61890ef28ca91e3ecf38e50c1c69
3. Set up directory as a Dart project
4. Open lib/src/model/model_object_builder.dart in VSCode
5. Go to line 36 and right click on modelBuilder, select "Go to Implementations".

Expected behavior
Show only links to valid implementations.

Screenshots

Please complete the following information:

• Operating System and version: macOS 13.13.1
• VS Code version: 1.78.0 (Universal)
• Dart extension version: 3.63.20230502
• Dart/Flutter SDK version: 3.1.0-86.0.dev
• Target device (if the issue relates to Flutter debugging): n/a