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This was revealed by gcc's undefined behavior sanitizer. The files Src/Containers/F{,Sub}Octree.hpp (“include” instead of “Src” in recent branches) contain several instances of:

~(~0x00LL << (3 *  some_expression ))

where ~0x00LL evaluates to -1LL. Left-shifting a negative number is undefined behavior in C++.

Solution: sed -i 's/~0x00LL/~0ULL/' Src/Containers/F{,Sub}Octree.hpp

Impacted versions: every branch and tagged commit is affected.