API for collapsing ranges

Context

• This issue is not a bug report. (please use a different template for reporting a bug)
• This issue is not a duplicate of an existing issue. (please use the search to find existing issues)

Description

Hi,
In our project the monaco editor displays a JSON, the content of which is sometimes refreshed from somewhere else. When this happens, I would like to restore the previous folding state. I have been doing this by reading out and later re-applying these collapsedRegions:

const viewState = editor.saveViewState();
viewState.contributionsState['editor.contrib.folding'].collapsedRegions

However, sometimes when I update my node packages, this functionality simply stops working even though the monaco-editor and @monaco-editor/react versions are unchanged (I can elaborate on that if you like).

I understand, since this is not public API things can break unexpectedly.
Is there perhaps a different way to programmatically read out collapsed ranges and to apply code folding?

Monaco Editor Playground Link

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Monaco Editor Playground Code

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