Duplicate diagnostics for RUF001 in VS Code

Describe the bug
I am seeing the same diagnostic reported twice in the VS Code "Problems" tab when using the Ruff extension. Specifically, the RUF001: Avoid equality comparisons to True; use is True for truth checks error appears two times for the same line of code.

To Reproduce
Steps to reproduce the behavior:

1. Set up a Python project using Poetry.
2. Add ruff to the development dependencies (poetry add ruff@latest --group dev).
3. Ensure the Ruff VS Code extension is installed and enabled.
4. Create a Python file with code that triggers the RUF001 rule, e.g., if variable == True:.
5. Open the file in VS Code.
6. Observe the "Problems" tab where the RUF001 diagnostic is listed twice for the same location.

Expected behavior
I would expect the diagnostic for the RUF001 error to appear only once in the "Problems" tab.

Screenshots

Environment

• VS Code:

  Version: 1.99.3 (user setup)
  Commit: 17baf841131aa23349f217ca7c570c76ee87b957
  Date: 2025-04-15T23:18:46.076Z (1 wk ago)
  Electron: 34.3.2
  ElectronBuildId: 11161073
  Chromium: 132.0.6834.210
  Node.js: 20.18.3
  V8: 13.2.152.41-electron.0
  OS: Windows_NT x64 10.0.19045
  

• Ruff VS Code Extension:

  Installation
  Identifier: charliermarsh.ruff
  Version: 2025.22.0
  Last Updated: 2025-04-23, 13:33:23
  Size: 33.03MB
  

• Ruff Version (from log): 0.11.6
• Python Version (from log interpreter path): Likely 3.11 (based on environment setup with poetry and python = "^3.11")
• Package Manager: Poetry

Relevant Configuration

.venv\Scripts\python.exe

pyproject.toml:

[tool.poetry]
name = "test_cicd"
version = "0.0.1"
description = "testing cicd pipelines"
authors = [""]
readme = "README.md"
packages = [{include = "dummy", from = "src"}]

[tool.poetry.dependencies]
python = "^3.11"
pydantic = "^2.6.4"
python-dotenv = "^1.0.1"

numpy = "^2.1.1"
pandas = "^2.2.3"

[tool.poetry.group.dev]
optional = true

[tool.poetry.group.dev.dependencies]
ipykernel = "^6.29"
pytest = "^8.1"
ruff = "^0.11.6"

[build-system]
requires = ["poetry-core"]
build-backend = "poetry.core.masonry.api"

[tool.pytest.ini_options]
pythonpath = [
  ".", "src",
]

[tool.ruff]
target-version = "py311"
line-length = 120

[tool.ruff.lint] # Add this section
    # select = ["E", "F"]
    # ignore = ["E501"] # Example
    ignore = [
        "E501", # line too long, handled by black
        "B008", # do not perform function calls in argument defaults
        "C901", # too complex
    ]

    select = [
        "E", # pycodestyle errors
        "W", # pycodestyle warnings
        "F", # pyflakes
        "I", # isort
        "C", # flake8-comprehensions
        "B", # flake8-bugbear
        "SIM" # simplify
    ]