JMX Job is not storing complete signature information in Form view.
Steps to reproduce the issue:
JMX_COMPOSITE_ADD NAME= (give any data more than 30 characters)
JMX_INVOKE= (give any data more than 30 characters and Signature java.lang.String,javax.management.openmbean.CompositeData
Release : 12.X
Component : AUTOMATION ENGINE
Cause: Design
Use the double quotes for the signature in JMX process.
Example: SIGNATURE="java.lang.String,javax.management.openmbean.CompositeData"
Now, when you go to form view in process tab and add an invoke operation. You will be able to view complete signature. Below Screenshot for reference.