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Single-token responses are rendered twice in Copilot chat #11907
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Public previewDescription
Type: Bug
This issue occurs in my WSL environment, not in my Windows environment.
If I ask Copilot any question, the output is rendered twice.
Noteworthy context: the running agent, HydraFusion, consistently outputs the error message "HydraFusion routing failed; continuing with gpt-5.6-terra" while thinking. The same is not true on Windows, which instead displays "Auto routed task to GPT-6 Luna".
(First screenshot shows duplicated response, second screenshot shows output & error message while thinking; this part is not duplicated)
Extension version: 0.104.3
VS Code version: Code 1.141.1 (7baac39ec3ca969dab74ac12c097f6a486e46593, 2026-10-12T12:00:06-07:00)
OS version: Windows_NT x64 10.0.26200
Modes:
Remote OS version: Linux x64 5.15.167.4-microsoft-standard-WSL2
System Info
A/B Experiments
vsliv368:30146709
binariesv615:30325510
nativeloc1:31344060
dwcopilot:31170013
dwoutputs:31242946
copilot_t_ci:31333650
e5gg6876:31282496
pythonrdcb7:31342333
6518g693:31463988
aj953862:31281341
b6b4d950:31327385
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cp_cls_t_966_ss:31526232
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cp_cls_c_1081:31454833
conptydll_true:31498968
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ei9d7968:31496641
chat:31457767
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2d1bi976:31596492
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ddid_t:31478206
hmra_i5g22:31518061
7df3h592:31512476
cp_cls_t_1082:31535311
b5d32f0b:31595862
logging_enabled_new:31498466
db5d2638:31499441
jb_cp_cls_t_632:31543129
56dj4588:31512888
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ha629193:31508444
jh5f2457_c:31540921
jbcp_cls_pctr_t:31531130
cp_intellij_t_nes:31548657
ahp-both-windows:31556933
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enable_editor_pane_layout:31569726
allow-none:31555437
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treatment-23-1:31555779
unuse_dynamic_mcp:31555281
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multiv2:31574985
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issue9151-7215f35b:31597540
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0485115c-2712-4002-b6e9-b5d4e30fb963:31595629
sessioninlinediffenabled_disabled:31587634
intellij_copilot_command_preview_c:31598260
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edbgf432:31599155
msft-auth-on:31593345
permission_prompt_treatment:1332566
ccr_pr_nudge_control:1319470
vsc_wsm_c:1340633
1g5a5742:1379227
4cj51803:1433348
cmc_aa_c:1435710
plus-and-new:1454857
c_ws_f8jhi663:1455089
seataa-a98d0257:1447868
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