Grammar checking does not work properly in non default user code snippets

[CrystalloidIron]

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

• VS Code Version: 1.89.1
• OS Version: Windows_NT x64 10.0.19045
• Electron: 28.2.8
• ElectronBuildId: 27744544
• Chromium: 120.0.6099.291
• Node.js: 18.18.2
• V8: 12.0.267.19-electron.0

1. 当我想创建一个新的用户配置并为其添加用户代码片段时，我发现为某个语言而创建的代码片段因其后缀名为‘.json’，即使在vscode右下角的语言模式中修改了选项为‘Code snippets’，仍然会被以JSON方式检查代码并报错，并不能如预设那般被以JSONC方式检查。即使已经将所有的拓展关闭，将项目文件夹也关闭，仍然会出现该情况。

[jrieken]

• lacks copy-paste friendly sample
• steps
• english description

[RedCMD]

you should use the file extension .code-snippets, not .json