DM 迁移mysql数据到tidb 时 execute statement failed: DELETE FROM XXX; "RawCause": "Error 1105 (HY000): runtime error: index out of range [1] with length 1"

上游 是 mysql5.7.25
具体迁移任务如下：
name: “sb”
task-mode: “all”
target-database:
host: “192.168.55.23” # 例如：172.16.10.83
port: 4000
user: “migrate_data”
password: “xxxxxxxxxxxxxxxxxxx”
mysql-instances:

• source-id: “mysql50132”
  block-allow-list: “ba-rule1”
  block-allow-list:
  ba-rule1:
  do-dbs: [“sb_geshui”,“zh_shenbao”]