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API child_path stops at level 5

My son is trying to generate chord progression using the API for his school science fair and he noticed that all chords ends at a length of 5 chords. However, when using the GUI at https://www.hooktheory.com/trends, the same progressions extend further.
For example, this progression:
https://api.hooktheory.com/v1/trends/nodes?cp=4,5,1,5,4
always returns response.status_code: 200 and response.text: ‘[]null’. Yet, the 6th chord shown in the GUI for the progression is ‘V’ with a probability of 74% (if selected, it would be the final one). For this reason, all the progressions generated for my son’s project sound incomplete. We would like to be able to end the progressions as suggested by the probabilities in the database.

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