I have occasionally had 'now broken' issues caused by deleted files
messing with/leaving behind those with relative anchors
Code:
<a href="../Text/1.html#goodbye-world">Chapter 2 – Goodbye world</a>
leaves
Code:
<a href="../#goodbye-world">Chapter 2 – Goodbye world</a>
but I have not had a properly formed (in original) end up broken in a simple split
(I use both the 'at marker' method and the immediate split)