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If that TV is not set, the default behavior is to use the id of the current page. If your Snippet call is in the content of your page and you are requesting the content as your field, your Snippet can go down the rabbit hole and infinitely loop on itself, causing your page request to time out with too many redirects.
Bottom line: if the Snippet call is inside the same field that you are requesting (e.g. content), then make sure the id parameter never points to the current page.