What version of Elysia is running?

1.4.16

What platform is your computer?

Darwin 24.6.0 arm64 arm

What environment are you using

bun 1.3.1

Are you using dynamic mode?

no

What steps can reproduce the bug?

new Elysia()
	.guard({
		cookie: t.Cookie({
			value: t.Optional(
				t.Object({
					a: t.String(),
					b: t.String(),
				}),
			),
		}),
	})
	.get("/cookie", ({ cookie: { value } }) => value.value)
	.post("/cookie", ({ cookie: { value } }) => {
		value.value = { a: "1", b: "2" };
	})
	.listen(3001);

Send 2 requests:
POST http://localhost:3001/cookie
then
GET http://localhost:3001/cookie

What is the expected behavior?

I expect to receive set-cookie header in POST response only.

What do you see instead?

Instead, i also receive set-cookie header for GET request. In reality, i was receiving set-cookie header in all other requests.

Additional information

No response

Have you try removing the node_modules and bun.lockb and try again yet?

yes