I have configured a jenkins job using active choice reactive reference parameter.
So, I have active choice parameter USER_AGENT_ALIAS and active choice reactive reference parameter USER_AGENT which provides actual user agent value based on what have been selected in USER_AGENT_ALIAS.
It works fine when i build job. I have made USER_AGENT as readonly.

But when i rebuild same build, there are two issues:
1. USER_AGENT field is editable now.
2. value of USER_AGENT doesn't get updated by its own if I change value of active choice parameter USER_AGENT_ALIAS.