[BUG] Zod issue during when scheduling a task via Typescript SDK

[abhijit-hota]

I have a task that can reschedule itself which looks like the following:

type InputType = { foo: string; bar: string };

export const myReschedulableTask = hatchet.task({
	name: "my_reschedulable_task",
	onEvents: ["schedule_trigger"],
	fn: async (input: InputType) => {
		const res = await myOperation(input);

		if (res?.rescheduleAt) {
			await myReschedulableTask
				.schedule(res.rescheduleAt, input, {
					additionalMetadata: {
						foo: input.foo,
						bar: input.bar,
					},
				})
				.then(() => {
					console.info(
						"Rescheduled my reschedulable task at %s",
						res.rescheduleAt.toISOString(),
					);
				})
				.catch((error) => {
					console.error(
						error,
						"Failed to reschedule my reschedulable task",
					);
				});
		}
	},
	executionTimeout: "5m",
});

async function myOperation(input: InputType): Promise<{ rescheduleAt: Date }> {
	// ...
}

This is the exact pattern I'm using to reschedule and it works fine locally with Hatchet Lite.

But after deploying the app which uses the cloud engine, I get this error:

TypeError: undefined is not an object (evaluating 'def.valueType._zod')
    at <anonymous> (/app/node_modules/zod/v4/core/schemas.cjs:1303:36)
    at anonymous (file:///app/node_modules/zod/v4/core/doc.cjs:23:40)
    at <anonymous> (/app/node_modules/zod/v4/core/schemas.cjs:936:23)
    at <anonymous> (/app/node_modules/zod/v4/core/parse.cjs:32:32)
    at <anonymous> (/app/node_modules/@hatchet-dev/typescript-sdk/v1/client/features/schedules.js:73:76)
    at <anonymous> (/app/node_modules/@hatchet-dev/typescript-sdk/v1/client/features/schedules.js:8:71)
    at new Promise (native:1:11)
    at <anonymous> (/app/node_modules/@hatchet-dev/typescript-sdk/v1/client/features/schedules.js:4:27)
    at <anonymous> (/app/node_modules/@hatchet-dev/typescript-sdk/v1/declaration.js:8:71)
    at new Promise (native:1:11)

Could this be a Zod version mismatch issue? We use Zod v4.1. I see that Hatchet SDK uses Zod v3.24 but the error has the /v4 path.

Environment

• SDK: TypeScript v1.10.0
• Runtime: Bun v1.2.21
• Engine: Cloud

Expected behavior
No error.

[abhijit-hota]

I just found out that every schedule call is failing. We haven't changed the call signature or the payload at all.

Reverting to 1.9.4 (the version we were using earlier) did not fix the issue either.

Please let us know if any more context is needed.