Can't suggest object correctly with certain schema definition.

[chuyangguangshin]

Describe the bug

Can't suggest object correctly with certain schema definition.

Schema used in the demo:

{
  "$schema": "http://json-schema.org/draft-07/schema",
  "type":"object",
  "oneOf": [
    {
      "additionalProperties": false,
      "properties": {
        "A" : {
          "type":"string"
        }
      },
      "required": [
        "A"
      ]
    },
    {
      "additionalProperties": false,
      "properties": {
        "B" : {
          "type":"string"
        }
      },
      "required": [
        "B"
      ]
    }
  ]
}

Expected Behavior

It should suggest A and B while the yaml is empty as version yaml-language-server 0.23.0 does.

Current Behavior

It only suggest A when yaml-language-server 1.9.1 installed

Not only in empty file. It will not suggest all possible objects at some child node position with the schema provided .

Steps to Reproduce

1. Config yaml to verify with the schema provided.
2. Trig suggestion on a empty yaml.

Environment

• Windows