fix: wrong single message read state.

[FGadvancer]

🔍 What type of PR is this?

👀 What this PR does / why we need it:

• My pull request adheres to the code style of this project
• My code requires changes to the documentation
• I have updated the documentation as required
• All the tests have passed

🅰 Which issue(s) this PR fixes:

Fixes #1441

📝 Special notes for your reviewer:

🎯 Describe how to verify it

📑 Additional documentation e.g., RFC, notion, Google docs, usage docs, etc.:

[sweep-ai]

Apply Sweep Rules to your PR?

• Apply: All new business logic should have corresponding unit tests.
• Apply: Refactor large functions to be more modular.
• Apply: Add docstrings to all functions and file headers.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (75375ad) 4.54% compared to head (1334487) 4.97%.
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##            main   #1443      +/-   ##
========================================
+ Coverage   4.54%   4.97%   +0.43%     
========================================
  Files         49      49              
  Lines       4140    4162      +22     
========================================
+ Hits         188     207      +19     
- Misses      3940    3943       +3     
  Partials      12      12              

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