Completion for "const" doesn't work inside "items"

Describe the bug

When I try to complete an array item which value is restricted by const nothing is suggested. But if I use enum instead of const, then completion brings up.

Expected Behavior

Completion should work in both cases.

Current Behavior

Already explained above.

Steps to Reproduce

Create JSON schema with the following content:

{
  "$schema": "http://json-schema.org/draft-07/schema#",
  "type": "array",
  "items": {
    "type": "string",
    "const": "pop"
  }
}

Create a test YAML file and link a JSON schema to it like this:

{
    "yaml.schemas": {
        "schema.json": "test.yaml"
    }
}

Try to type -<space> inside this test file and press Ctrl+Space to get no completion.

Environment

• Windows
• Mac
• Linux
• other (please specify)

Start by reproducing the issue with the provided draft-07 schema, linked test.yaml, and Ctrl+Space after typing an array item. Trace the YAML completion path for items with const and compare it with enum handling; done means the value "pop" is suggested in this scenario.