editor.unicodeHighlight.ambiguousCharacters and editor.unicodeHighlight.invisibleCharacters do not correctly work only when opening VSCode

[adusamr]

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

• VS Code Version: 1.95.2 (user setup)
• OS Version: Windows_NT x64 10.0.22631

Steps to Reproduce:

1. Copy and paste below text and save it as test.md (they are not usual ASCII characters)

ＡＢＣ　ＤＥＦ

2. Close VSCode while opening test.md
3. Open VSCode, then you see ＡＢＣ　ＤＥＦ is highlighted
4. Close 'test.md' (don't close VSCode) and reopen test.md
5. ＡＢＣ　ＤＥＦ highlight disappears

defaultSettings.json is like this:

{
	"editor.unicodeHighlight.ambiguousCharacters": true,
	"editor.unicodeHighlight.invisibleCharacters": true,
	"[markdown]":  {
		"editor.unicodeHighlight.ambiguousCharacters": false,
		"editor.unicodeHighlight.invisibleCharacters": false,
	}
}

ＡＢＣＤＥＦ are ambiguous characters and the space 　 is invisible character.
So in .md file, ＡＢＣ　ＤＥＦ should not be highlighted.

I posted another issue microsoft/vscode-docs#7773 regarding overwriting these settings in user settings. I don't know it is relating to this issue.

[RedCMD]

related #231224