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Having pygls.protocol.json_rpc ValueError after updating to 2025.6.0 from 2025.4.0 #25060

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Closed as not planned
@mondwan

Description

@mondwan
Issue body actions

Type: Bug

Behaviour

Once updated the python extension from 2025.4.0 to 2025.6.0, the vscode python extension starts behaved strange.

Before the updates, there will be a tooltip for the documentation on whatever varaible, modules I highlighted. After the updates, it stopped working after a while.

It worked fine if I rollback to 2025.4.0. Is it because I am still using python3.8 instead?

Steps to reproduce:

  1. Install the latest version of Python plugin
  2. Mouse hover to the variable / module
  3. There should be a tooltip showing the document of that variable / module
  4. After a while, it stopped showing the doc, but keep showing Loading...

Diagnostic data

Output for Python in the Output panel (ViewOutput, change the drop-down the upper-right of the Output panel to Python)

2025-05-13 10:22:46.286 [info] ERROR:pygls.protocol.json_rpc:Failed to handle request 80 textDocument/documentSymbol DocumentSymbolParams(text_document=TextDocumentIdentifier(uri='file:///home/vdc/....venv/lib/python3.8/site-packages/.../services.py'), work_done_token=None, partial_result_token=None)
Traceback (most recent call last):
  File "/home/vdc/.vscode-server/extensions/ms-python.python-2025.6.0-linux-x64/python_files/lib/jedilsp/jedi/cache.py", line 110, in wrapper
    return dct[key]
KeyError: ((), frozenset())

Extension version: 2025.6.0
VS Code version: Code 1.100.0 (19e0f9e681ecb8e5c09d8784acaa601316ca4571, 2025-05-07T12:48:53.763Z)
OS version: Windows_NT x64 10.0.22631
Modes:
Remote OS version: Linux x64 5.4.0-200-generic

  • Python version (& distribution if applicable, e.g. Anaconda): 3.8.10
  • Type of virtual environment used (e.g. conda, venv, virtualenv, etc.): Venv
  • Value of the python.languageServer setting: Jedi
User Settings


languageServer: "Jedi"

testing
• promptToConfigure: false
• pytestEnabled: true
• autoTestDiscoverOnSaveEnabled: false

Installed Extensions
Extension Name Extension Id Version
black-formatter ms- 2024.6.0
debugpy ms- 2025.8.0
docker doc 0.6.0
gitlab-workflow Git 6.13.1
gitlens eam 17.0.3
hcl has 0.6.0
intellicode-api-usage-examples Vis 0.2.9
isort ms- 2025.0.0
js-debug ms- 1.100.0
live-server ms- 0.4.15
php-cs-fixer jun 0.3.21
php-debug xde 1.36.1
php-docblocker nei 2.7.0
phpcs ika 1.0.5
phpunit ema 4.16.1
python ms- 2025.6.0
remote-kubernetes Okt 0.5.2
vscode-coverage-gutters rya 2.13.0
vscode-docker ms- 1.29.6
vscode-eslint dba 3.0.10
vscode-intelephense-client bme 1.14.4
vscode-js-profile-table ms- 1.0.10
vscode-kubernetes-tools ms- 1.3.23
vscode-openapi 42C 4.33.2
vscode-pylance ms- 2025.4.1
vscode-yaml red 1.18.0
vscodeintellicode Vis 1.3.2
System Info
Item Value
CPUs Intel(R) Core(TM) i7-10850H CPU @ 2.70GHz (12 x 2712)
GPU Status 2d_canvas: enabled
canvas_oop_rasterization: enabled_on
direct_rendering_display_compositor: disabled_off_ok
gpu_compositing: enabled
multiple_raster_threads: enabled_on
opengl: enabled_on
rasterization: enabled
raw_draw: disabled_off_ok
skia_graphite: disabled_off
video_decode: enabled
video_encode: enabled
vulkan: disabled_off
webgl: enabled
webgl2: enabled
webgpu: enabled
webnn: disabled_off
Load (avg) undefined
Memory (System) 31.78GB (18.43GB free)
Process Argv
Screen Reader no
VM 0%
Item Value
Remote SSH: vm027943
OS Linux x64 5.4.0-200-generic
CPUs Intel(R) Xeon(R) Platinum 8462Y+ (2 x 0)
Memory (System) 7.76GB (6.03GB free)
VM 100%

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