Variables not expanding when the terminal autoruns on startup (Win10 → WSL)

Issue Type: Bug

set up your workspace JSON as follows:

{
"folders": [
    {
        "path": "."
    }
],
"settings": {
    "terminal.integrated.env.linux": {
        "PATH": "${workspaceFolder}:${env:PATH}"
    }
}
}

close VSCode while in the workspace leaving the integrated terminal open (so that it restarts automatically at the next time)
launch VSCode again

the terminal pops up and says:

コマンド 'lesspipe' は以下の場所で利用できます
* /bin/lesspipe
* /usr/bin/lesspipe
'/bin:/usr/bin'がPATH環境変数に含まれていないためコマンドを特定できませんでした。
lesspipe: コマンドが見つかりません
コマンド 'dircolors' は '/usr/bin/dircolors' で利用できます
'/usr/bin'がPATH環境変数に含まれていないためコマンドを特定できませんでした。
dircolors: コマンドが見つかりません

(it complains in Japanese about /bin:/usr/bin not included in $PATH)

$ echo $PATH
${workspaceFolder}:${env:PATH}

open a new terminal and it correctly sources PATH

$ echo $PATH
/mnt/my/Workspace/Folder:/home/me/.vscode-server/bin/blahblah...

VS Code version: Code 1.43.0 (78a4c91400152c0f27ba4d363eb56d2835f9903a, 2020-03-09T19:47:57.235Z) OS version: Windows_NT x64 10.0.18363 Remote OS version: Linux x64 4.4.0-18362-Microsoft

System Info

|Item|Value| |---|---| |CPUs|AMD Ryzen 7 1700 Eight-Core Processor (16 x 2994)| |GPU Status|2d_canvas: enabled
flash_3d: enabled
flash_stage3d: enabled
flash_stage3d_baseline: enabled
gpu_compositing: enabled
multiple_raster_threads: enabled_on
oop_rasterization: disabled_off
protected_video_decode: unavailable_off
rasterization: enabled
skia_renderer: disabled_off_ok
video_decode: enabled
viz_display_compositor: enabled_on
viz_hit_test_surface_layer: disabled_off_ok
webgl: enabled
webgl2: enabled| |Load (avg)|undefined| |Memory (System)|31.95GB (21.90GB free)| |Process Argv|| |Screen Reader|no| |VM|0%| |Item|Value| |---|---| |Remote|WSL: Ubuntu-18.04| |OS|Linux x64 4.4.0-18362-Microsoft| |CPUs|AMD Ryzen 7 1700 Eight-Core Processor (16 x 3000)| |Memory (System)|31.95GB (21.91GB free)| |VM|0%|

Extensions (40)

Extension|Author (truncated)|Version ---|---|--- better-comments|aar|2.0.5 vsc-material-theme|Equ|32.5.0 vsc-material-theme-icons|equ|1.1.4 ace|eva|0.0.1 auto-close-tag|for|0.5.6 textile|idl|0.1.5 sdlang|Lau|0.1.2 procfile-support|log|0.0.1 vscode-language-pack-ja|MS-|1.43.6 remote-wsl|ms-|0.42.3 material-icon-theme|PKi|4.0.1 ayu|tea|0.18.0 vscode-ruby|win|0.27.0 material-theme|zhu|3.2.3 insert-unicode|bru|0.7.1 better-toml|bun|0.3.2 githistory|don|0.6.3 EditorConfig|Edi|0.14.4 crystal-lang|fau|0.3.14 auto-close-tag|for|0.5.6 auto-complete-tag|for|0.1.0 auto-rename-tag|for|0.1.1 code-runner|for|0.9.17 sass-lint|gle|1.0.6 todo-tree|Gru|0.0.169 align-by-regex|jan|1.0.4 asciidoctor-vscode|joa|2.7.13 nim|kos|0.6.4 formate|Mik|1.1.4 vscode-language-pack-ja|MS-|1.43.6 python|ms-|2020.2.64397 cpptools|ms-|0.26.3 trailingwhitespacehighlighter|paj|0.0.2 ruby|reb|0.27.0 rust|rus|0.7.0 crates|ser|0.4.9 vscode-table-formatter|shu|1.2.1 sass-indented|syl|1.7.5 vscode-ruby|win|0.27.0 better-align|wwm|1.1.6 (4 theme extensions excluded)

microsoft / vscode

Variables not expanding when the terminal autoruns on startup (Win10 → WSL) #92799