Fix map json encoding

[mmarchois]

Cette PR permet de corriger le bug de parsing du JSON

SyntaxError: Expected ',' or ']' after array element in JSON at position 65536 (line 2 column 65536)
    at JSON.parse (<anonymous>)
    at MutationObserver.<anonymous> 

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.10%. Comparing base (78cabc5) to head (99d166a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #808 +/- ## ========================================= Coverage 99.10% 99.10% Complexity 1165 1165 ========================================= Files 218 218 Lines 4929 4929 ========================================= Hits 4885 4885 Misses 44 44 ```

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