AJAX API (GET /cart.js) returns inconstant tokens

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1

Sometimes the AJAX API (GET /cart.js)

returns tokens in the longer format (Z2NwLXVzLWVhc3QxOjAxSkpOSEhDR05IM0tENlRBV0FDMktUWlBD?key=6184a46df0a4e29cbea6cf658ae903a6)
sometimes in the shorter format (6a6d0880ec1fce20e61deaf9c6f0b188)