I need help. Does anyone know why, when I deploy this code in NetSuite and try to edit a Sales Order, the log doesn't show and it doesn't let me save the order?

probably something to do with

handlers

why not just

const beforeSubmit = (context) => {...}

return {
    beforeSubmit
}

context.type === context.UserEventType.EDIT

also, not the issue but FWIW,

log.debug()

has no such signature as what you're passing. It works, but it's undocumented and not recommended.