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We found this solution:
cy.get('#element').then(($field) => {
            let isAExist = haveAttr($field[0].attributes, 'A')
            let isBExist = haveAttr($field[0].attributes, 'B')

            if (isAExist == false && isBExist == false) {
              expect(true).to.be.equal(false)
              console.log("There is no attr")
            }

            console.log("Attr exist")
          })