Fix witness deser

[cffls]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.52%. Comparing base (3034cd9) to head (af5a6f1).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #385      +/-   ##
==========================================
+ Coverage   85.30%   85.52%   +0.22%     
==========================================
  Files          32       32              
  Lines        4213     4181      -32     
  Branches     1060     1046      -14     
==========================================
- Hits         3594     3576      -18     
+ Misses        434      423      -11     
+ Partials      185      182       -3     

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