Auto-complete is not working for first-level elements of some schemas

I created test in Yaml Language Server and it is working fine https://github.com/apupier/yaml-language-server/tree/tesCamelK

I created similar test in VS Code Yaml and it is failing: https://github.com/apupier/vscode-yaml/tree/testCamelKSchema

in UI, to reproduce manually:

• bind this schema https://raw.githubusercontent.com/apupier/vscode-yaml/testCamelKSchema/test/testFixture/schemas/camelk_schema.json to *.cmalek.yaml file

• create a file test.camelk.yaml

• put similar content than https://github.com/apupier/vscode-yaml/blob/testCamelKSchema/test/testFixture/completion/completion-secondlevel.camelk.yaml (take care of spaces)

• trigger completion at the end of the file
  --> there is no completion provided by the Yaml Language server (i checked the ouput of the language server and it returns an empty list of completionitem)

Compare the working Yaml Language Server test on the tesCamelK branch with the failing VS Code Yaml testCamelKSchema branch, especially test/testFixture/schemas/camelk_schema.json and test/testFixture/completion/completion-secondlevel.camelk.yaml. Bind the schema to a .cmalek.yaml file, trigger completion at the end, and use the test or language-server output to confirm that first-level completions are returned.