In my limited XS experience, I've found it best to start putting in a lot of sv_dump()
calls to wherever I feel suspicious in the XS source. I have not seen the code in question, so I can't offer you my opinions where that might be.
Since sv_dump() is not recursive (it won't follow references, nor parse array or hash elements), you may find Devel::Peek::Dump function more useful (if the code is in Perl, of course).
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