getInitialSnapshot initialize the machine twice

[asfktz]

Bug or feature request?

Bug

Description:

When calling:

getInitialSnapshot(machine, { param: "test" });

It gets called twice:

• 1st time - without input: undefined
• 2nd time - with input: { param: "test" }

Also, if the machine invokes another actor, it throws:

proxyConsole.js:64 Error: Actor with system ID 'child' already exists.

Expected result:

That getInitialSnapshot will initialize the machine once with the provided input.

Reproduction

import { createMachine, fromCallback, getInitialSnapshot } from "xstate";

const machine = createMachine({
  context: ({ input }) => {
    console.log("input in context", input);
    return {};
  },
  invoke: {
    systemId: "child",
    src: fromCallback(() => {}),
  },
});

getInitialSnapshot(machine, { param: "test" });

https://codesandbox.io/p/sandbox/jolly-goodall-kg7858?file=%2Fsrc%2Findex.js