无效的帐户鉴别器下载元副词集合

Question

我从Anchor 0.17更新到版本0.24，从那以后，获取收集帐户失败，锚误差如下： 错误：无效的帐户歧视

这是我的代码，

export const getCollectionPDA = async (candyMachineAddress: string): Promise<anchor.web3.PublicKey> => {
    return (
        await anchor.web3.PublicKey.findProgramAddress(
            [Buffer.from("collection"), new PublicKey(candyMachineAddress).toBuffer()],
            new PublicKey(CANDY_MACHINE_PROGRAM_V2)
        )
    )[0];
};

const provider = new AnchorProvider(connection, getmywallet(), {
       preflightCommitment: "finalized",
       commitment: "finalized",
});

const idl = await Program.fetchIdl(CANDY_MACHINE_PROGRAM_V2, provider);
const anchorProgram = new Program(idl, CANDY_MACHINE_PROGRAM_V2, provider);

const candyMachineId = "63gzhYWxJ4Yfc5QahLxV6NChSjJZNWW93Sy9CHz8YkCe";
const collectionPDA = await getCollectionPDA(candyMachineId);
const collectionPDAAccount = await connection.getAccountInfo(collectionPDA);

const collectionData = await anchorProgram.account.collectionPda.fetch(new PublicKey(collectionPDA.toString()));

我想知道这里发生了什么。也许收集帐户结构已更新，区块链包含旧结构？直到最近，Anchor才开始检查吗？