Some change in some Parser.XML related module seems to have broken the autodoc table of contents generation:
Parsing structure file "structure/traditional.xml". Executing reference expansion and queueing node insertions. Parsing autodoc file "build/autodoc.xml". Moving appendices. Executing node insertions. Writing final manual source file. Strange children count: 69: bin/assembler()->TocNode(#0:2,dl) children:({ }) mChildren:({ }) Need to run walk_preorder()? Took 17 seconds.
As you can see above n->count_children() has returned 69, which seems reasonable, but n->mChildren hasn't been updated, which hints that n->walk_preorder2() hasn't been called.