I am absolutely dont have cy.task().then in my code. I only have cy.fixture and then next inside with cy.task only. Also, it is only happen in browserstack testing. It doesnt have this problem when testing in cypress runner locally.

Hey Himson, that's helpful to know. Without a code sample it's hard to identify what's occurring. It's also definitely possible that this is related to the Browserstack implementation, especially since it's only happening there. I'd recommend leveraging their support.

i am sorry. I cannot share the code. But thank you for your help