Fix bug in isResolved

[travisbrown]

I've got some bigger changes incoming that include a test fix that turned up this bug, so I'm not adding a separate test here.

[codecov-commenter]

Codecov Report

Merging #285 (4702e17) into main (1f9e2ab) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #285   +/-   ##
=======================================
  Coverage   58.62%   58.62%           
=======================================
  Files          30       30           
  Lines         928      928           
  Branches       60       60           
=======================================
  Hits          544      544           
  Misses        384      384           

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