[BUG] Custom CSS cannot be applied.

[94tiger]

Environment

Self-Hosted (Docker)

System

Docker

Version

2.1.1

Describe the problem

style.css

@font-face {
  font-family: "NanumBarunpenB";
  src: url("/fonts/NanumBarunpenB.ttf");
}

conf.yaml

appConfig:
  externalStyleSheet: ['/assets/style.css']

I saved the above to a file. And applied like. --font-body: "NanumBarunpenB", serif;
However, css was not applied, and when the same content written in style.css was applied in the UI, it was applied.
This is not permanently applied, but only applied temporarily when the 'Save Changes' button is pressed, and restored when refreshing.

css applied after pressing 'Save Changes' button

Additional info

No response

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• You've checked that this issue hasn't already been raised
• You've checked the docs and troubleshooting guide
• You agree to the code of conduct

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[CrazyWolf13]

can confirm, something there is either broken or the documentation outdated, to less detailed.