GitHub integration's fetch_github_issue tool fails to find existing issues despite connected account, returning "not found" errors for valid issue numbers

Describe the Bug

Cursor’s GitHub integration fails to fetch existing GitHub issues through the AI assistant’s fetch_github_issue tool, despite having a connected GitHub account. The tool returns “GitHub issue #[number] was not found in the repository” for issues that demonstrably exist in the repository. This prevents the AI assistant from accessing detailed issue information that should be available through the GitHub integration.

Steps to Reproduce

Connect your GitHub account to Cursor (which I have done)
Ask the AI assistant to fetch details about a specific GitHub issue from your repository.

Specifically, I asked “Can you help me to undestand @Collapse the same level nodes except this node · Issue #2488 · freeplane/freeplane · GitHub ?” and used model claude-4-sonnet.

The AI assistant uses the fetch_github_issue tool with parameters:
issueNumber: 2488
repo: freeplane/freeplane
Tool returns error: “Error calling tool: GitHub issue #2488 was not found in the repository”
Verify the issue actually exists by checking the web or GitHub directly - issue #2488 does exist in freeplane/freeplane repository (opened June 1, 2025, by @MajestyApril, with labels “feature request” and “makes sense”)
Expected result: Tool should successfully fetch the issue details
Actual result: Tool claims the issue doesn’t exist when it clearly does

Operating System

MacOS

Current Cursor Version (Menu → About Cursor → Copy)

Version: 1.1.3 (Universal)
VSCode Version: 1.96.2
Commit: 979ba33804ac150108481c14e0b5cb970bda3260
Date: 2025-06-15T06:37:17.379Z
Electron: 34.5.1
Chromium: 132.0.6834.210
Node.js: 20.19.0
V8: 13.2.152.41-electron.0
OS: Darwin arm64 23.6.0

Does this stop you from using Cursor

No - Cursor works, but with this issue