Hi ProfoxSistemas,
Greetings from Syncfusion support.
Sorry for the delay in getting back to you.
This issue has already been identified, logged, and addressed by our development team.
We have included the fix for the issue "Messages not fully rendered on initial load and after sending a new message in Chat UI component" with our package version 33.1.47. Please upgrade to the latest package version and let us know if you need any further assistance.
Output:
Please feel free to reach out if you need any further clarification or assistance in the meantime.
Regards,
Kirupa.