Describe the Bug

Repro:

• pip install jupyterlab jupyter-lsp jupyterlab-lsp pandas pyrefly
• verify that Pyrefly is running in the bottom left, and select Pyrefly if it's not automatically turned on
• add from pandas import read_csv to the first cell
• put cursor on read-csv, right click, go to def
• "No Jump Targets Found"
• Server logs show "Handling non-canceled request textDocument/definition (154)" but the response is empty

Note that go-to-def on matplotlib functions seem to work correctly now (see #1045)

Sandbox Link

No response

(Only applicable for extension issues) IDE Information

No response