[Issue]: A issue got in Autogen tutorial (conversation pattern, group chat)

[renxinxing123]

Describe the issue

This is the result when I run the code in autogen tutorial (conversation pattern, group chat), the adder_agent was prompted and supposed to add 1 to a given number, however, for the first adder_agent and the last adder_agent, they seem didn't add 1 to 6 and 9 respectively.

Steps to reproduce

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Screenshots and logs

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Additional Information

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