Markdown Preview does not auto-update on edit, requires manual refresh

Type: Bug

The built-in Markdown preview functionality does not automatically update when the markdown source file is modified. The preview remains static until the "Refresh Preview" button is clicked manually.

VS Code version: Code 1.135.0 (08d4889f9ec4a1685d257b9b95de036c8e1ce1e5, 2026-08-25T14:26:52Z)
OS version: Windows_NT x64 10.0.26200
Modes:
Remote OS version: Linux arm64 5.15.0-314.193.5.4.el8uek.aarch64

System Info

|Item|Value|
|---|---|
|CPUs|AMD Ryzen 5 5500U with Radeon Graphics (12 x 2096)|
|GPU Status|2d_canvas: enabled
GPU0: VENDOR= 0x1002, DEVICE=0x164c [AMD Radeon(TM) Graphics], DRIVER_VENDOR=AMD, DRIVER_VERSION=31.0.21912.3005 *ACTIVE*
GPU1: VENDOR= 0x1414, DEVICE=0x008c [Microsoft Basic Render Driver], DRIVER_VERSION=10.0.26100.8972
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)|17.85GB (0.35GB free)|
|Process Argv|--crash-reporter-id 2e67a61a-aa85-48ba-bd92-3c8394344e0e|
|Screen Reader|no|
|VM|0%|

|Item|Value|
|---|---|
|Remote|SSH: oracle2|
|OS|Linux arm64 5.15.0-314.193.5.4.el8uek.aarch64|
|CPUs|Neoverse-N1 (2 x 0)|
|Memory (System)|11.40GB (7.09GB free)|
|VM|0%|
Extensions (9)

Name|Identifier|Author|Version
---|---|---|---
Claude Code for VS Code|anthropic.claude-code|Anthropic|2.1.251
vscode-pandoc|chrischinchilla.vscode-pandoc|ChrisChinchilla|0.7.3
Claude Code Usage|growthjack.claude-code-usage|GrowthJack|2.3.0
Folder Size|xiaoluoboding.vscode-folder-size|xiaoluoboding|0.1.0
Jupyter Keymap|ms-toolsai.jupyter-keymap|ms-toolsai|1.1.2
Remote - SSH|ms-vscode-remote.remote-ssh|ms-vscode-remote|0.124.0
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
vscode-pdf|tomoki1207.pdf|tomoki1207|1.2.2

A/B Experiments

```
vsliv368cf:30146710
pythonvspyt551cf:31249601
binariesv615:30325510
nativeloc1:31344060
dwcopilot:31170013
dwoutputs:31242946
copilot_t_ci:31333650
e5gg6876:31282496
pythonrdcb7:31342333
6518g693:31463988
aj953862:31281341
82j33506:31327384
envsactivate1:31551504
cloudbuttont:31379625
3efgi100_wstrepl:31403338
ddidt:31399633
ec5jj548:31422691
cp_cls_t_966_ss:31526232
4je02754:31466945
8hhj4413:31478653
cp_cls_c_1081:31454833
conptydll_true:31498968
e9c30283:31461165
46204921:31447328
ei9d7968:31496641
chat:31457767
ddid_t:31478206
hmra_i5g22:31518061
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
jf4hg949:31526829
ahp-both-windows:31556933
sessions_5:31532894
ihg5j128:31534457
f412h606:31551416
9gg7f176:31542112
enable_editor_pane_layout:31569726
allow-none:31555437
ac562147:31564510
c7c27ce7:31554789
1h923230:31564177
1532g621_copy:31554320
treatment-23-1:31555779
unuse_dynamic_mcp:31555281
0d8dfbc3:31570291
nemo-v2:31565334
0c1h4866:31566224
session-mark-done:31558131
5b8j3302:31564601
mangle-name-control:31572633
allow-signed-out:31574473
9e5id457:31573761
39a5d156:31574986
permission_prompt_control:1332567
ccr_pr_nudge_adoption:1319471
vsc_wsm_c:1340633
eh853263:1355661

```