Chat marked as "Done" disappears from Sessions view with no filter to restore it

Type: Bug

VS Code version:

Version: 1.134.0 (Universal)
Commit: 110a328ea54b42367b803ec53ee0bf52ef26b419
Date: 2026-08-18T18:24:44Z
OS: Darwin arm64 (macOS)
@github/copilot: 1.0.81-0

Does this issue occur when all extensions are disabled?: Not applicable — the Sessions view is part of the chat experience.

Steps to Reproduce:

Open the Sessions view (chat sessions panel).
Hover a session and click Mark as Done (⌘Backspace).
Observe the session immediately disappears from the list.
Open the filter menu (funnel icon) and confirm Completed, Archived, Read, and every source (Local/Cloud/Copilot CLI/Copilot/Claude) are all checked.
Toggle between Sort by Created and Sort by Updated; click Reset.
Reload the window (Developer: Reload Window).
Use the Sessions search (magnifier) to search for the session's title.
Expected: With all status filters enabled (including Completed/Archived), a session marked as Done should be reachable — either shown in the list or surfaced via search — and there should be a way to un-mark it as Done.

Actual: A session marked as Done vanishes from the list and cannot be restored through any available filter, sort, reset, window reload, or search. There is no "Done" entry in the filter menu, so the state has no corresponding toggle to reveal it. The underlying chat data is intact on disk (.../workspaceStorage//chatSessions/.jsonl), so this is purely a view/state visibility problem. Reproduced deterministically on a second session.

Additional notes: The filter menu exposes statuses Completed / In Progress / Input Needed / Failed and Read / Archived, but none corresponds to the "Done" state applied by the Mark as Done action, and no "Unmark as Done" affordance is discoverable.

VS Code version: Code 1.134.0 (Universal) (110a328ea54b42367b803ec53ee0bf52ef26b419, 2026-08-18T18:24:44Z)
OS version: Darwin arm64 25.6.0
Modes:

System Info

|Item|Value|
|---|---|
|CPUs|Apple M3 (8 x 2400)|
|GPU Status|2d_canvas: enabled
GPU0: VENDOR= 0x106b [Google Inc. (Apple)], DEVICE=0x0000 [ANGLE (Apple, ANGLE Metal Renderer: Apple M3, Version 26.6.2 (Build 25G83))], DRIVER_VENDOR=Apple, DRIVER_VERSION=26.6.2 *ACTIVE*
Machine model name: Mac
Machine model version: 15.12
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: enabled_on
trees_in_viz: disabled_off
video_decode: enabled
video_encode: enabled
webgl: enabled
webgpu: enabled
webnn: disabled_off|
|Load (avg)|2, 2, 2|
|Memory (System)|16.00GB (0.07GB free)|
|Process Argv|--crash-reporter-id 3eea3503-ef87-481f-a140-78a7fe364104|
|Screen Reader|no|
|VM|0%|
Extensions (17)

Name|Identifier|Author|Version
---|---|---|---
Rainbow CSV|mechatroner.rainbow-csv|mechatroner|3.24.1
Python Debugger|ms-python.debugpy|ms-python|2026.6.0
Python|ms-python.python|ms-python|2026.4.0
Pylance|ms-python.vscode-pylance|ms-python|2026.3.1
Python Environments|ms-python.vscode-python-envs|ms-python|1.36.0
Jupyter|ms-toolsai.jupyter|ms-toolsai|2025.9.1
Jupyter Keymap|ms-toolsai.jupyter-keymap|ms-toolsai|1.1.2
Jupyter Notebook Renderers|ms-toolsai.jupyter-renderers|ms-toolsai|1.3.0
Jupyter Cell Tags|ms-toolsai.vscode-jupyter-cell-tags|ms-toolsai|0.1.9
Jupyter Slide Show|ms-toolsai.vscode-jupyter-slideshow|ms-toolsai|0.1.6
Remote - SSH|ms-vscode-remote.remote-ssh|ms-vscode-remote|0.128.0
Remote - SSH: Editing Configuration Files|ms-vscode-remote.remote-ssh-edit|ms-vscode-remote|0.87.0
Remote Explorer|ms-vscode.remote-explorer|ms-vscode|0.5.0
Quarto|quarto.quarto|quarto|1.136.0
R Debugger|rdebugger.r-debugger|RDebugger|0.5.6
R|reditorsupport.r|REditorSupport|2.8.8
R Syntax|reditorsupport.r-syntax|REditorSupport|0.1.4

A/B Experiments

```
vsliv368:30146709
vswsl492cf:30256860
binariesv615:30325510
nativeloc1:31344060
dwcopilot:31170013
dwoutputs:31242946
copilot_t_ci:31333650
e5gg6876:31282496
pythonrdcb7:31342333
6518g693:31463988
aj953862:31281341
4f60g487:31327383
envsactivate1:31551504
gh487529:31544284
cloudbuttont:31379625
3efgi100_wstrepl:31403338
ec5jj548:31422691
diffpatch-lysithea-0014-prod-ctrl:31572514
cp_cls_t_966_ss:31526232
4je02754:31572277
8hhj4413:31478653
ge8j1254_inline_auto_hint_haiku:31490510
cp_cls_c_1081:31454833
conptydll_true:31498968
e9c30283:31461165
test_treatment2:31471001
46204921:31447328
control_6dc23131:31555649
ei9d7968:31496641
nes-extended-on:31455476
chat:31457767
8hig5102:31480529
89g7j272:31518289
i2gc6536:31499202
52612955:31516516
23c7c724:31520045
ddid_c:31478207
hmra_i5g22:31518061
ja75b849:31569110
ie3bb177:31557831
7df3h592:31512476
cp_cls_t_1082:31535311
logging_enabled_new:31498466
j0d79568:31499440
jb_cp_cls_t_632:31543129
56dj4588:31512888
32d76977:31512328
ha629193:31508444
jh5f2457_c:31540921
jbcp_cls_pctr_t:31531130
61138546:31518536
cp_intellij_t_nes:31548657
d7b18187:31526828
ahp-both-windows:31556933
sessions_5:31532894
ihg5j128:31534457
f412h606:31551416
9gg7f176:31542112
sandbox-ui-on-2:31543161
enable_editor_pane_layout:31569726
allow-none:31555437
fd5dc207:31551400
36h42362:31564511
c7c27ce7:31554789
1h923230:31564177
0dg73464:31554319
treatment-23-1:31555779
unuse_dynamic_mcp:31555281
0d8dfbc3:31570291
switchtoauto:31559321
0c1h4866:31566224
vrbsty_fls:31561059
session-mark-done:31558131
5b8j3302:31564601
mangle-name-treatment:31572634
permission_prompt_treatment:1332566
ccr_pr_nudge_control:1319470
vsc_wsm_t:1340632
h5e14506_copy:1348995

```