Is State Vector Reduction a 'Process'?

Is state-vector reduction (or collapse of the wavefunction) a physical
process? Or is it really an artefact of our procedure of canonical
quantisation?

In the Feynman path integral approach to Quantum Theory, state-vector
reduction doesn't seem to be a process any more than asking the
question: What is the amplitude of going from a certain initial state
to a final state?

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