Hi - another great question and surprisingly difficult to answer.
My ‘perfect’ approach would be.
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Record the ‘diagnosis’ in the context at which it was made e.g the ‘Admission diagnosis’ in the ‘Admission template’, the ‘ward diagnosis’ in the Ward template, and this where it gets complex the poor junior doc who has to make a diagnosis at 4am for some other issue, perhaps a related UTI but not the ‘principal diagnosis’ under consideration.
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Maintain a separate contextual problem list for this hospital admission which has an idea of a principal diagnosis, co-morbidities and other problems (for this admission). This is the real source of truth for what I think you are trying to acheive - to be able to update and refine the ‘principal diagnosis’ as the case progresses.
Technically this can be done most easily by maintaining a separate ‘episode persistent’ Problem list composition, and just cloning the contents of the original diagnoses. A better approach is to hold links and references in the problem list composition back to the original records, but that is more complex to manage technically and in querying.