I believe a good mystery narrative should be fair in providing narrative clues through foreshadowing and scattering subtle hints; so both the protagonist and the reader have an equal opportunity to uncover the mystery.
Instead of inserting a new chapter to patch the plot hole, I pasted the transition chapter (x') into the old chapter and merged the old chapter (chapter y) with the old chapter above it (chapter z) into one combined chapter (chapter yz).
So, chapter x' = transition chapter (new); chapter yz = combined chapter y (old) + chapter z (old).


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