This is how GenTool "fixes" it:

dptr_GhostObject = 0xA2C280
fptr_CleanupBuilding = 0x774830

//////////////////////////////////////////////////////////////////////////////////////

bool CGameAccess::Hack_ClearBuggedBuildings() const
{
	if (dptr_GhostObject.Address() && fptr_CleanupBuilding.Address())
	{
		void (__stdcall* ClearBuggedBuilding)(DWORD) = reinterpret_cast<void (__stdcall*)(DWORD)>(fptr_CleanupBuilding.Address());
		const DWORD copyAddress = fptr_CleanupBuilding.Address() + 0xDC;
		const DWORD copyNumBytes = 0x44;
		BYTE copy[copyNumBytes];
		::memcpy(copy, (const void*)copyAddress, copyNumBytes);

		// Write no operation instructions to copy address
		Hack_Nop(copyAddress, copyNumBytes);

		DWORD object = *(DWORD*)(*(DWORD*)dptr_GhostObject.Address() + 0x10);
		while (object)
		{
			ClearBuggedBuilding(object);
			object = *(DWORD*)(object + 0x7C);
		}

		// Write back original bytes to copy address
		Hack_WriteBytes(copyAddress, copy, copyNumBytes);
		return true;
	}
	return false;
}

//////////////////////////////////////////////////////////////////////////////////////

// CPU Disasm (Zero Hour 1.04)
// Address   Hex dump          Command                                  Comments
// 004A46DA  |.  A1 88B6A200   MOV EAX,DWORD PTR DS:[0A2B688]
// 004A46DF  |.  8B40 0C       MOV EAX,DWORD PTR DS:[EAX+0C]
// 004A46E2  |.  8B40 24       MOV EAX,DWORD PTR DS:[EAX+24]
// 004A46E5  |.  8B0D 80C2A200 MOV ECX,DWORD PTR DS:[0A2C280]
// 004A46EB  |.  8B11          MOV EDX,DWORD PTR DS:[ECX]
// 004A46ED  |.  50            PUSH EAX
// 004A46EE  |.  FF52 1C       CALL DWORD PTR DS:[EDX+1C]

// Calls game function 0x774A80 and spawns new meshes for the previous deleted ones
// Also changes the actual replay master player to the new one

void CGameAccess::Hack_SpawnFixedBuildings() const
{
	if (!dptr_Players.Address())
		return;

	if (!dptr_GhostObject.Address())
		return;

	DWORD playerNum = *(DWORD*)(*(DWORD*)(*(DWORD*)dptr_Players.Address()+0xC)+0x24);
	DWORD pGhostObject = *(DWORD*)dptr_GhostObject.Address();
	DWORD pSomething = *(DWORD*)pGhostObject;

	const DWORD spawnAllNewObjectsPtr = *(DWORD*)(pSomething+0x1C);
	void (__fastcall* SpawnAllNewObjects)(DWORD, DWORD, DWORD) = reinterpret_cast<void (__fastcall*)(DWORD, DWORD, DWORD)>(spawnAllNewObjectsPtr);
	SpawnAllNewObjects(pGhostObject, pSomething, playerNum);
}

//////////////////////////////////////////////////////////////////////////////////////

// Loops through all world buildings and sets their render state to 0
// Causes object refresh through function 0x539C50 or similar

void CGameAccess::Hack_RefreshBuildingFogStates() const
{
	if (!dptr_GhostObject.Address())
		return;

	DWORD offset = *(DWORD*)(*(DWORD*)dptr_GhostObject.Address() + 0x4);
	DWORD pBuilding = *(DWORD*)(*(DWORD*)dptr_GhostObject.Address() + 0x10);

	while (pBuilding)
	{
		DWORD pFogStates = *(DWORD*)(pBuilding + 0x28);
		*(EFogState*)(offset*4+pFogStates+0x30) = eFogState_None;
		*(EFogState*)(offset*4+pFogStates+0x70) = eFogState_GoingFog;

		pBuilding = *(DWORD*)(pBuilding + 0x7C);
	}
}


update loop:

	// Refresh buildings on first frame in Replay to avoid the "black supply" issue
	// It has to happen on Frame 1 - Frame 0 does not work
	if (frameId == 1 && IsReplay())
	{
		if (gGame.Hack_ClearBuggedBuildings())
		{
			gGame.Hack_SpawnFixedBuildings();
			gGame.Hack_RefreshBuildingFogStates();
		}
	}

Not particularly useful but perhaps gives a bit of a clue where to start looking and how to approach it.

Supply Dock is black/shadowed in Replay playback #439

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