Gemini 3 Pro (Preview) chat formatting error #281831
Description
Type: Bug
When using Copilot with the Gemini 3 Pro (Preview) in "Ask" mode when it outputs code the code is repeated 2-3 times, with part of the last bit of code outside of the code block in the chat. Reviewing the Chat log I could see that Gemini Pro 3 replied with the correct code (that is, not dupli/triplicated) within triple backticks, despite the initial instructions from vs code/copilot specifying that it should be wrapped in 4 backticks. After explicitly asking in the chat to use 4 backticks and retry sending the code, it did so correctly. However the code still appeared dupli/triplicated and partially outside the code block. This appears to be a bug with the chat view, rather than the Gemini 3 Pro (Preview) model. Asking it to apply the changes seem to work correctly.
To reproduce:
- Select Gemini 3 Pro (Preview) as model in github copilot in "Ask" mode.
- Open some code and request some kind of changes
- See the error in formatting in the code block.
(EDIT: Added screenshot, no worries the secrets/passwords are not actually in use :-) )
VS Code version: Code 1.106.3 (bf9252a, 2025-11-25T22:28:18.024Z)
OS version: Linux x64 6.14.0-36-generic
Modes:
System Info
| Item | Value |
|---|---|
| CPUs | Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz (8 x 2699) |
| GPU Status | 2d_canvas: enabled 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: disabled_software vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: disabled_off webnn: disabled_off |
| Load (avg) | 1, 1, 1 |
| Memory (System) | 15.47GB (9.87GB free) |
| Process Argv | helsepsykologene.code-workspace --crash-reporter-id 424164c4-323f-423d-99d5-731afecc7457 |
| Screen Reader | no |
| VM | 0% |
| DESKTOP_SESSION | ubuntu-wayland |
| XDG_CURRENT_DESKTOP | Unity |
| XDG_SESSION_DESKTOP | ubuntu-wayland |
| XDG_SESSION_TYPE | wayland |
Extensions (32)
| Extension | Author (truncated) | Version |
|---|---|---|
| rust-bundle | 1Yi | 1.0.0 |
| better-comments | aar | 3.0.2 |
| vscode-sqlite | ale | 0.14.1 |
| vscode-fish | bma | 1.0.49 |
| ruff | cha | 2025.32.0 |
| rustowl-vscode | cor | 0.3.4 |
| flask-snippets | cst | 0.1.3 |
| rust-syntax | dus | 0.6.1 |
| prettier-vscode | esb | 11.0.2 |
| dependi | fil | 0.7.21 |
| code-runner | for | 0.12.2 |
| chatgpt-vscode | gen | 0.0.13 |
| copilot-chat | Git | 0.33.4 |
| rest-client | hum | 0.25.1 |
| bash-ide-vscode | mad | 1.43.0 |
| pyrefly | met | 0.44.2 |
| python-essentials | mik | 1.0.1 |
| vscode-containers | ms- | 2.3.0 |
| black-formatter | ms- | 2025.2.0 |
| debugpy | ms- | 2025.16.0 |
| python | ms- | 2025.18.0 |
| vscode-pylance | ms- | 2025.10.4 |
| vscode-python-envs | ms- | 1.12.0 |
| live-server | ms- | 0.4.16 |
| autodocstring | njp | 0.6.1 |
| rust-analyzer | rus | 0.3.2702 |
| vscode-djaneiro | the | 1.4.2 |
| native-preview | Typ | 0.20251207.1 |
| todo-list | Tza | 1.6.0 |
| copy-file-contents-to-clipboard | und | 0.0.1 |
| explorer | vit | 1.36.0 |
| pretty-ts-errors | Yoa | 0.6.1 |
A/B Experiments
vsliv368:30146709
binariesv615:30325510
vscrp:30673768
nativeloc1:31344060
dwcopilot:31170013
dwoutputs:31242946
copilot_t_ci:31333650
e5gg6876:31282496
pythonrdcb7:31342333
aj953862:31281341
b6b4d950:31327385
nes-set-on:31351930
6abeh943:31336334
envsdeactivate2:31353495
cloudbuttont:31379625
todos-1:31405332
qwen_all_req:31402696
3efgi100_wstrepl:31403338
trigger-command-fix:31379601
auto_model_enabled:31385282
use-responses-api:31390855
je187915:31401257
afag3459:31428711
ec5jj548:31422691
copilot-nes-oct-t:31418199
terminalsuggestenabled:31426255
cmp-ext-treat:31426748
cp_cls_c_966_ss:31426491
defaultvisibility:31426295
expandedtokens:31427242
c0683394:31419495
g0h3h215:31426582
478ah919:31426797
2bd77578_control:31426889
a5gib710:31426879
5j92g670_sonnet:31426787
cp_jb_t_lixleitest:31428973