I have an extension under development, and most of the time provideCompletionItems correctly displays the items returned by provideCompletionItems as suggestions.
- VSCode Version: 1.45.0
- OS Version: Mac 10.15.4
However, in some cases, when I am for sure returning items as an array, I see "No suggestions." Screenshot:

You can see in the DEBUG CONSOLE I am printing to the debug log an array of length 2 just before I return it as the completion items results. Relevant code here:
https://github.com/kortina/vscode-markdown-notes/blob/ak-bug-reference/src/extension.ts#L146
Is this a bug with VS Code that I should report, or am I misunderstanding the functionality of provideCompletionItems / do I need to do something else to have this reliably show the suggestions I am returning?