"editor.suggest.InsertMode": "insert" not respected

Type: Bug

Typing text that generates a suggestion will delete the text to the right even if editor.suggest.insertMode is set to "insert" which is documented as not doing that.

Extension version: 1.24.0
VS Code version: Code 1.82.2 (abd2f3db4bdb28f9e95536dfa84d8479f1eb312d, 2023-09-14T05:51:20.981Z)
OS version: Linux x64 5.19.0-50-generic
Modes:

System Info

|Item|Value|
|---|---|
|CPUs|Intel(R) Core(TM) i5-10400 CPU @ 2.90GHz (12 x 4000)|
|GPU Status|2d_canvas: enabled
canvas_oop_rasterization: disabled_off
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
video_decode: enabled
video_encode: disabled_software
vulkan: disabled_off
webgl: enabled
webgl2: enabled
webgpu: disabled_off|
|Load (avg)|1, 1, 0|
|Memory (System)|23.37GB (17.84GB free)|
|Process Argv|/home/staltux/Documents/Project-Beetle-Force --crash-reporter-id af359ae4-6c44-43f1-a34a-02e770153ec4|
|Screen Reader|no|
|VM|0%|
|DESKTOP_SESSION|xfce|
|XDG_CURRENT_DESKTOP|XFCE|
|XDG_SESSION_DESKTOP|xfce|
|XDG_SESSION_TYPE|x11|

A/B Experiments

```
vsliv368cf:30146710
vsreu685:30147344
python383:30185418
vspor879:30202332
vspor708:30202333
vspor363:30204092
vstes516:30244333
vslsvsres303:30308271
vserr242cf:30382550
pythontb:30283811
vsjup518:30340749
pythonptprofiler:30281270
vshan820:30294714
vstes263:30335439
vscoreces:30445986
vscod805cf:30301675
binariesv615:30325510
bridge0708:30335490
bridge0723:30353136
vsaa593:30376534
pythonvs932:30410667
py29gd2263cf:30792227
vsclangdf:30486550
c4g48928:30535728
dsvsc012:30540252
pynewext54:30695312
azure-dev_surveyone:30548225
2e4cg342:30602488
89544117:30613380
showlangstatbar:30737416
03d35959:30757346
pythonfmttext:30731395
fixshowwlkth:30771522
showindicator:30805244
pythongtdpath:30769146
i26e3531:30792625
pythonnosmt12:30797651
pythonidxptcf:30805731
pythonnoceb:30805159
copilotsettingc:30839828
dsvsc013:30795093
dsvsc014:30804076
diffeditorv2:30821572
pythonmhint1:30842940
dsvsc015:30845448

```