上游mysql 执行DDL，DM同步下游到TIDB报错

把几个字段改成了 not null
ALTER TABLE snspaycenter.t_paymethod CHANGE COLUMN pm_alias pm_alias VARCHAR(60) CHARACTER SET UTF8 COLLATE utf8_general_ci NOT NULL DEFAULT _UTF8MB4’’ COMMENT ‘后台名称’;
ALTER TABLE snspaycenter.t_paymethod CHANGE COLUMN pm_show_name pm_show_name VARCHAR(60) CHARACTER SET UTF8 COLLATE utf8_general_ci NOT NULL DEFAULT _UTF8MB4’’ COMMENT ‘对外名称’;

在tidb执行错误提示

ERROR 1265 (01000): Data truncated for column ‘pm_show_name’ at row 1