VSCode Prescribed use of Patterns flagged as missing Begin Property

[aamarks]

Why does this flag patterns if they come directly under an item in repository without a begin/end?

An example straight from the documentation gets warnings:
https://code.visualstudio.com/api/language-extensions/syntax-highlight-guide

{
  "scopeName": "source.abc",
  "patterns": [{ "include": "#expression" }],
  "repository": {
    "expression": {
      "patterns": [{ "include": "#letter" }, { "include": "#paren-expression" }]  // flags this line
    }, ...

Object is missing property begin required by property patterns.

I like the idea of grouping language keys like this rather than putting them all in the main patterns. Is that wrong or something wrong with the schema?

[ExE-Boss]

This shouldn’t be happening.