PVS-Studio warning V519 for WildMagic5

class WM5_GRAPHICS_ITEM StencilState : public Object
{
  ....
  OperationType OnFail;
  OperationType OnZFail;
  OperationType OnZPass;
};

StencilState* VisualEffect::LoadStencilState (FileIO& inFile)
{
  ....
  sstate->OnFail = (StencilState::OperationType)onFail;
  sstate->OnZFail = (StencilState::OperationType)onZFail;
  sstate->OnZFail = (StencilState::OperationType)onZPass;
  ....
}

This suspicious code was found in WildMagic5 project by PVS-Studio static code analyzer.
Warning message is:
V519 The 'sstate->OnZFail' variable is assigned values twice successively. Perhaps this is a mistake. Check lines: 444, 445. wm5visualeffect.cpp 445

PVS-Studio is a static analyzer for detecting bugs in the source code of applications written in C, C++, C++11, C++/CX. Site: http://www.viva64.com/en/pvs-studio/