Call set_defaults once

[victorlin]

Suggested by @huddlej in #2029 (comment)

Checklist

• Automated checks pass
• Check if you need to add a changelog message
• Check if you need to add tests
• Check if you need to update docs

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.25%. Comparing base (c8cc27c) to head (4ead944).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2030      +/-   ##
==========================================
- Coverage   73.25%   73.25%   -0.01%     
==========================================
  Files          86       86              
  Lines       10755    10754       -1     
  Branches     2096     2096              
==========================================
- Hits         7879     7878       -1     
  Misses       2502     2502              
  Partials      374      374              

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