This is a follow-up question to How to replace the word "Chapter" for appendix items with "Appendix" in book using titlesec.

I've tried \begin{appendices} ... \end{appendices} and, whilst it does not show any errors, the word Chapter appears for Appendix items in TOC.

Change to \appendix (and do nothing else) and the word Chapter changes to Appendix. I am just surprised because the former would appear to be a more precise control.

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    Which question? You have enough reputation to add comments to their answer(s)? Ok, it's this question: tex.stackexchange.com/questions/231872/… – user31729 Mar 7 '15 at 18:21
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    It's not preferred. I've simply replaced \begin{appendices}...\end{appendices} (to say all the truth it was \begin{appendix}...\end{appendix}) with \appendix simply to apply \g@addto@macro to \appendix. You were not using any feature of that environment. – karlkoeller Mar 7 '15 at 18:28
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    I've added the same solution with the appendices environment in my answer at your previous question. – karlkoeller Mar 7 '15 at 18:41