Consider

// ModuleD
// +--> ModuleC
// +reex> ModuleA
// +reex> ModuleB
// +--> ModuleA

ModuleD is expected to load class from ModuleA - This works

However, with this setup

// ModuleD
// +--> ModuleC
// +reex> ModuleB
// | +--> ModuleA
// +reex> ModuleA

ModuleD is cannot load class from ModuleA

The re-export capability of ModuleA seems to get lost. Probably because the paths from ModuleA were already seen without re-export.