Node unreachable to each other with MUTATION message dropped

Cluster setup: Ubuntu 18.04-LTS, cassandra-3.11.10. One DC, 3 nodes, 2 replication factor;

Using an injector to filter and drop MUTATION message between one node and the other two (drop MUTATION messages sent from node 1 to node 2, 3 and drop MUTATION messages sent from node 2, 3 to node 1). At the same time, inserted same key, different values on node 1 and node 2. When insertion happened, MUTATION message drops were caught on both node 1 and node2. Then we observed the different values for that key on two nodes and observed all three nodes disconnected from each other. 

./nodetool describecluster

/Cluster Information:Cluster Information: 
Name: Test Cluster Snitch: org.apache.cassandra.locator.GossipingPropertyFileSnitch DynamicEndPointSnitch: enabled Partitioner: org.apache.cassandra.dht.Murmur3Partitioner 
Schema versions: UNREACHABLE: [10.0.1.8, 10.0.1.7, 10.0.1.9]