Vaadin flow Components - Invalid JSON from server

We are facing strange issue in my UI. When we are requesting data from server we are getting error “Invalid JSON from sever: for(;:wink: … …”. It is happening for few components(Messages will be displayed in Grid) when the App is deployed in remote server. But it is not happening if i deploy App in local sever and access same component.

Attached image.

Could you please help me to invistigate what could be the problem?
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Sounds like https://github.com/vaadin/flow/issues/4660 if you are using long polling?