I've seen the bug introduced in a Redux selector that did something similar - it sorted the array using some criteria and returned the top 10 or so elements.
In doing so, the selector mutated the Redux store - something that should never happen. The bug was 'hard-to-find' because:
the bug was only effected if the app functionality that exercised the selector was used;
whether or not the bug was effected depended upon the data in the store and how 'sorted' it was; and
when it was effected, parts of the app seemed to be weirdly inconsistent.
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The example that Emil gave is pretty typical.
I've seen the bug introduced in a Redux selector that did something similar - it sorted the array using some criteria and returned the top 10 or so elements.
In doing so, the selector mutated the Redux store - something that should never happen. The bug was 'hard-to-find' because: