propagate writable attribute to secondaryfiles

[mr-c]

Fixes: #2131

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.80%. Comparing base (dbcec2a) to head (be7c7cd).
⚠️ Report is 32 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2133      +/-   ##
==========================================
+ Coverage   84.78%   84.80%   +0.01%     
==========================================
  Files          46       46              
  Lines        8366     8376      +10     
  Branches     1962     1966       +4     
==========================================
+ Hits         7093     7103      +10     
  Misses        806      806              
  Partials      467      467              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.