Dubbo3.1.2经常找不到服务的提供者

有时候A服务调用C服务时报错没有服务提供者，但是B服务调用C服务正常。且注册中心Nacos中A/B/C服务都有提供注册，且A/B是C服务的订阅者。一切看上去都正常，但A调用C就是会报错没有服务提供者，重启C服务就恢复了。
Dubbo版本 3.1.2 应用级注册订阅
Nacos版本 2.1.2

The report names Dubbo 3.1.2, Nacos 2.1.2, and application-level registration, but no source files, tests, or entry points. Start by reproducing the A-to-C failure while B-to-C succeeds, then inspect provider registration and subscription state in Nacos. Done means explaining the inconsistent discovery behavior and adding a regression test or other verification for the corrected case.

Written by the indexing model from the issue text.