springboot druid配置多数据源的时候undo_log没有记录

按springboot sample ,配置了druid多数据源用注解动态切换,@GlobalTransactional不生效,undo_log中不会生成记录,日志中`DefaultGlobalTransaction` 会显示 `rollback status:Rollbacked`,但是不会roll back

Start by reproducing the Spring Boot sample with Druid configured for multiple data sources and dynamic annotation-based switching. Inspect the undo_log contents and the DefaultGlobalTransaction rollback logs; done means @GlobalTransactional creates the expected undo_log record and the transaction rolls back correctly.

Written by the indexing model from the issue text.