Why doesn't cypress see the css value of the border * property?

cy.get("[data-e2e='dispatcher-checkbox'] i[data-e2e='checkbox']").should(
        "have.css",
        "border-radius",
        convertToRGB(theme("colors.greys.2")),
      )

All other property values ​​are seen, but the values ​​of properties starting with border and the border itself, says that the value = "" enter image description here