YAML `---` for "Multiple documents within a single stream" doesn't work [YAML Language Server]

[Originally reported as https://github.com/redhat-developer/vscode-yaml/issues/995, before I understood this really belongs more here.]

I wrote my first trivial JSON schema enola.schema.jsonc, like this:

{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://docs.enola.dev/json-schema/enola_meta.schema.jsonc",
  "title": "Enola.dev Meta Model",
  "description": "See https://docs.enola.dev",
  "type": "object",
  "additionalProperties": false,
  "properties": {
    "name": {
      "type": "string",
      "description": "Short technical name of this Type."
    }
  },
  "required": ["name"]
}

Then I wrote an test.yaml file using that schema, like this:

# yaml-language-server: $schema=enola.schema.jsonc

name: enola.dev/url
doc: enola.md#URL

---
name: enola.dev/id
doc: enola.md#ID

Current Behavior

It does put a "red squiggle" on the first doc: enola.md#URL but not on the second doc: enola.md#ID.

In fact the 2nd name: enola.dev/id doesn't have the "hover" with the descriptionfrom the schema either.

It looks like the YAML --- syntax for "multiple documents within a single stream" isn't supported / doesn't work?

Expected Behavior

I expected it to flag the doc attribute as red in both my URL and ID attributes.

Reproduce the behavior with the provided enola.schema.jsonc and test.yaml examples, then inspect the YAML language-server entry points that handle schema validation and hover information for documents after ---. Confirm that both documents receive the schema diagnostics and property descriptions; the issue is done when the second document behaves like the first.