Polars dataframe not loading

[TamasVal00]

Type: Bug

Behaviour

Expected vs. Actual

XXX

Steps to reproduce:

1. XXX

Diagnostic data

• Jupyter extension version: 2025.9.1
• Python extension version: 2026.4.0
• .NET Install Tool for Extension Authors extension version: 3.1.0
• Python runtime version: 3.12.0 (tags/v3.12.0:0fb18b0, Oct 2 2023, 13:03:39) [MSC v.1935 64 bit (AMD64)]
• Python package dependencies:

{
  "installed": {
    "pandas": "3.0.3",
    "pyarrow": "25.0.0",
    "numpy": "2.5.1",
    "polars": "1.42.1"
  },
  "required": {
    "pandas": "1.2.0"
  },
  "unsatisfied": [],
  "failedChecks": [
    "pyspark",
    "tensorflow",
    "torch",
    "xarray"
  ]
}

• Entrypoint: JupyterCellStatusBar
• Active mode: dataViewer

Extension version: 1.24.2
VS Code version: Code 1.129.1 (8a7abeba6e03ea3af87bfbce9a1b7e48fed567b8, 2026-07-17T15:35:09Z)
OS version: Windows_NT x64 10.0.26100
Modes:

System Info

Item	Value
CPUs	13th Gen Intel(R) Core(TM) i7-1365U (12 x 2688)
GPU Status	2d_canvas: enabled GPU0: VENDOR= 0x8086, DEVICE=0xa7a1 [Intel(R) Iris(R) Xe Graphics], DRIVER_VENDOR=Intel, DRIVER_VERSION=32.0.101.7084 ACTIVE GPU1: VENDOR= 0x1414, DEVICE=0x008c [Microsoft Basic Render Driver], DRIVER_VERSION=10.0.26100.8521 Machine model name: Machine model version: 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 trees_in_viz: disabled_off video_decode: enabled video_encode: enabled webgl: enabled webgpu: enabled webnn: disabled_off
Load (avg)	undefined
Memory (System)	31.66GB (11.82GB free)
Process Argv	--crash-reporter-id 0cb685c0-632a-40ff-9d7a-a19e681eb3f9
Screen Reader	no
VM	0%

A/B Experiments

vsliv368cf:30146710
binariesv615:30325510
nativeloc1:31344060
dwcopilot:31170013
dwoutputs:31242946
copilot_t_ci:31333650
e5gg6876:31282496
pythonrdcb7:31342333
6518g693:31463988
aj953862:31281341
4f60g487:31327383
63221493:31336333
envsactivate1:31551504
gh487529:31544284
cloudbuttont:31379625
42190218_ostrepl:31403339
ec5jj548:31422691
cp_cls_t_966_ss:31526232
4je02754:31466945
c3h7c220:31478652
cp_cls_c_1081:31454833
conptydll_true:31498968
e9c30283:31461165
test_treatment2:31471001
46204921:31447328
idci7584:31464702
e3e4d672:31494082
ei9d7968:31496641
chat:31457767
7e187181:31503455
ghj88844:31499326
ddid_t:31478206
hmra_i5g22:31518061
7df3h592:31512476
cp_cls_t_1082:31535311
logging_enabled_new:31498466
db5d2638:31499441
jb_cp_cls_t_632:31543129
56dj4588:31512888
32d76977:31512328
ha629193:31508444
cdk-lw-on:31524445
f9bf7985:31543584
a1ije391_t:31540920
hgf2d445:31529595
8hfba999:31537718
prpt_lrg:31518466
jbcp_cls_pctr_t:31531130
61138546:31518536
cp_intellij_t_nes:31548657
d7b18187:31526828
h561g132:31533256
session_8:31532895
ihg5j128:31534457
f412h606:31551416
9gg7f176:31542112
allow-none:31552288
fd5dc207:31551400