SolrCloud collection can not not execute query ( No live SolrServers available to handle this request) but the graph shows they are active

Question

• environment:
  • one centos7 with jdk1.8.0_261, solr-8.6.1, zookeeper3.5.8, tomcat-8.5.57
• description:
  • one zookeeper Pseudo-cluster(on a