Terminal split is broken

[agex-n7]

Issue Type: Bug

Since updating to 1.58 this morning, splitting terminals no longer works.
I can open a new terminal (via the + or the shortcut) in a certain directory.
However, when I then try to split that same terminal (both via the button in the optional terminal management and the shortcut), I get an error notification:
The terminal process failed to launch: Starting directory (cwd) "\home\dev\development\core\blah" does not exist.
It's clearly the exact same directory I just opened in the terminal.

Not sure if it makes a difference, but I'm accessing a remote workspace using VS Code's Remote SSH.

I hope this helps and you can figure out the issue! Cheers

VS Code version: Code 1.58.1 (2aeda6b, 2021-07-13T06:58:28.115Z)
OS version: Windows_NT x64 10.0.19042
Restricted Mode: No
Remote OS version: Linux x64 5.4.0-72-generic
Remote OS version: Linux x64 5.4.0-72-generic

System Info

Item	Value
CPUs	AMD Ryzen 7 4800H with Radeon Graphics (16 x 2895)
GPU Status	2d_canvas: enabled gpu_compositing: enabled multiple_raster_threads: enabled_on oop_rasterization: enabled opengl: enabled_on rasterization: enabled skia_renderer: enabled_on video_decode: enabled vulkan: disabled_off webgl: enabled webgl2: enabled
Load (avg)	undefined
Memory (System)	15.37GB (7.17GB free)
Process Argv	--crash-reporter-id 89cf2575-8433-4bb5-a67e-60ef7e0903e6
Screen Reader	no
VM	33%

Item	Value
Remote	SSH: Removed the IP address
OS	Linux x64 5.4.0-72-generic
CPUs	Intel(R) Core(TM) i7-9700K CPU @ 3.60GHz (8 x 800)
Memory (System)	62.73GB (26.98GB free)
VM	0%

Item	Value
Remote	SSH: Removed the IP address
OS	Linux x64 5.4.0-72-generic
CPUs	Intel(R) Core(TM) i7-9700K CPU @ 3.60GHz (8 x 800)
Memory (System)	62.73GB (26.98GB free)
VM	0%

Extensions (10)

Extension	Author (truncated)	Version
remote-ssh	ms-	0.65.7
remote-ssh-edit	ms-	0.65.7
material-icon-theme	PKi	4.8.0
multi-cursor-case-preserve	Car	1.0.5
gitlens	eam	11.6.0
prettier-vscode	esb	8.0.1
vscode-styled-components	jpo	1.6.4
code-spell-checker	str	1.10.2
change-case	wma	1.0.0
vscode-proto3	zxh	0.5.4

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pythonptprofiler:30281270
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pythondataviewer:30285071
vscus158:30321503
pythonvsuse255cf:30335482
vscod805cf:30301675
pythonvspyt200:30331937
vscextlangct:30333562
binariesv615:30325510
bridge0708:30335490

[meganrogge]

/duplicate #128277