ericren opened a new issue #8121:
URL: https://github.com/apache/dubbo/issues/8121
### Environment
* Dubbo version: 2.7.12
* Operating System version: windows10
* Java version: 1.8
### Steps to reproduce this issue
目前想使用dubbo2.7.12的TagRouter进行标签传递，有应用A和应用B
应用A有方法 test
应用B有两个方法 b1、b2
> public void test() {
> RpcContext.getContext().setAttachment(CommonConstants.TAG_KEY,"tag1");
> B.b1();
> B.b2();
> }
A.test()调用前set tag路由标签：
A.test() ->
B.b1()时，通过RpcContext.getContext().getAttachment(CommonConstants.TAG_KEY)
能正常拿到tag，
但当B.b2()的时候，RpcContext.getContext().getAttachment(CommonConstants.TAG_KEY)就为null了
预期：是想要能在 B.b1()后，tag标签能继续传递下去。
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