DM-43570: Fix round-tripping of masked floating point columns introduced in DM-43187

[erykoff]

Checklist

• [x ] ran Jenkins
• [x ] added a release note for user-visible changes to doc/changes
• (if changing dimensions.yaml) make a copy of dimensions.yaml in configs/old_dimensions

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.94%. Comparing base (b1cf303) to head (95201bf).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #985   +/-   ##
=======================================
  Coverage   88.94%   88.94%           
=======================================
  Files         329      329           
  Lines       42473    42476    +3     
  Branches     8718     8717    -1     
=======================================
+ Hits        37778    37781    +3     
  Misses       3443     3443           
  Partials     1252     1252           

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