editor.codeLensFontFamily setting only work temporarily on macOS 10.13.6

[inetfuture]

VS Code version: Code 1.53.0 (8490d3d, 2021-02-03T16:01:04.046Z)
OS version: Darwin x64 17.7.0

System Info

Item	Value
CPUs	Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz (8 x 3600)
GPU Status	2d_canvas: enabled gpu_compositing: enabled metal: disabled_off multiple_raster_threads: enabled_on oop_rasterization: unavailable_off opengl: enabled_on protected_video_decode: unavailable_off rasterization: unavailable_off skia_renderer: disabled_off_ok video_decode: enabled webgl: enabled webgl2: enabled
Load (avg)	3, 3, 3
Memory (System)	16.00GB (0.19GB free)
Process Argv	-psn_0_90134 --crash-reporter-id fdea18b1-6d1e-46eb-a4e5-bd8e595aad3a
Screen Reader	no
VM	0%

Extensions: none

A/B Experiments

vsliv368cf:30146710
vsreu685:30147344
python383cf:30185419
vspor879:30202332
vspor708:30202333
vspor363:30204092
vswsl492:30211401
pythonvsdeb440:30248342
pythonvsded773:30248341
pythonvspyt875:30251590

Steps to Reproduce:

1. Change global editor.codeLensFontFamily setting to 'Courier New'（a mono space font on macOS）.
2. Reload window.
3. Open a file tracked by Git, Git CodeLens first shows with default font, then 'Courier New'.
4. Switch to another file, Git CodeLens shows with default font, always.
5. Swithc back to the first file, Git CodeLens shows with default font, always, 'Courier New' not working any more, font size works though.

Does this issue occur when all extensions are disabled?: Yes

[jrieken]

I can reproduce. The font family is defined with a css variables and the dom node that holds the value of that variable isn't around yet when receiving configured styles...