Indent seems wrong

I have several settings to ensure 4 spaces as indent but frontmatter seems to not use them.

```
  "[markdown]": {
    "files.trimTrailingWhitespace": false,
    "editor.tabSize": 4,
    "files.autoSave": "afterDelay"
  },
```
And:
```
  "editor.tabSize": 4,
```

But after setting/updating the date it reverts my tags to 2 spaces:

```
tags:
  - productivity
  - typescript
```