The important question here is whether the newly deployed process model has the same model version (not to confuse with the deployment version which is assigned internally and has no “external” impact). If it has the same model version then the instance will continue to run under the updated model. The result of the process execution then depends on whether the new step was added before or after the step that receives the Xdocument.
If you’ve changed the model version, then the instance will continue tu run with the old model. Newly created instances will be associated with the new model though.
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