In the explorer, the chain ID that is added automatically is incorrect. It attempts to use 57057, which results in an error and prevents the chain from being added automatically in the Wallet app.
However, when the same action is performed through the Bridge, the Wallet app is launched to add zkSYS Devnet using chain 274 (the temporary ID we are using for the tests). This mismatch between the chain ID provided by the explorer (57057) and the correct ID used in our tests (274) is the cause of the failure.