OK, I don't remember we enable RETRANSFORMATION.
We are blocking adding this feature for a very long time, due to make the
agent installed service stable.
I am a little confused about what you said.
agentBuilder.type(pluginFinder.buildMatch())
.transform(new Transformer(pluginFinder))
.with(AgentBuilder.RedefinitionStrategy.RETRANSFORMATION)
.with(new Listener())
.installOn(instrumentation);
The former code is in master.
https://github.com/apache/skywalking/blob/master/apm-sniffer/apm-agent/src/main/java/org/apache/skywalking/apm/agent/SkyWalkingAgent.java