Web Messaging Guest API integration - truncated message

Hi Community,
we have developed an application, written in java and running on-prem on a Tomcat application server, that implements the Web Messaging Guest API.
We have defined a Messenger Deployment, and we have connected an Architect flow where we invoke a Chatbot, developed on Google DialogFlow CX. The intergration works correctly.
However, we noticed that if a message forwarded by DFCX is longer than 2000 characters, it is truncated.
Is this a by default behavior?
Reading through the FAQs regarding the Web Messaging widget we read that the limit would be 4096 characters.

Thanks in advance
Marco

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