debug json ecoding failure

[Borda]

Before submitting

• Was this discussed/approved via a Github issue? (no need for typos and docs improvements)
• Did you make sure to update the docs?
• Did you write any new necessary tests?

What does this PR do?

seems that the Warning is not caught by the sphinx #288

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[codecov]

Codecov Report

Merging #289 (bee85ca) into main (dc01f0b) will decrease coverage by 1%.
Report is 2 commits behind head on main.
The diff coverage is 100%.

Additional details and impacted files

@@         Coverage Diff         @@
##           main   #289   +/-   ##
===================================
- Coverage    72%    71%   -1%     
===================================
  Files         2      2           
  Lines       394    397    +3     
===================================
- Hits        284    283    -1     
- Misses      110    114    +4