@VishalB8 I have verified the support ticket and can see that it was closed a month ago.
The support team suggested that you check startup, setclasspath, service (bat or sh) files present in tomcat bin folder and see if there is any parameter with encode has set. In proconfig please see if the below value are there:
When the values are to be encoded we have to select "Mapping Type" as "x-www-form-urlencoded" and as a best practice values are to be passed by using parameters.
The ticket was resolved with the suggestion of adding the UTF-8 encoding as part of the JVM arguments and you handled the issue using urlencoding function.
As the issue was resolved by selecting url-encoded for message type in rest post method I will proceed to mark this as the accepted solution.