Bug: transposed pointer range exception in _get_all_nns when nd->n_descendants ≤ K

[jsalamIMS]

Environment:

• Language : C++
• OS : Windows 11
• Compiler : MSVC 19.42 (Visual Studio 2022)
• Annoy version : 1.17.3

Issue Description

When querying a particular index using get_nns_by_item/get_nns_by_vector, getting exception "Transposed pointer range" at
annoylib.h --> Line No: 1474 --> nns.insert(nns.end(), dst, &dst[nd->n_descendants]);

Additional Context

The Annoy index file is generated with a dimension of 256 and total size of around 8 GB
Pointer values observed : nd->n_descendants : -1088797586