diff --git a/src/lua_baselib.c b/src/lua_baselib.c
index 5c52d1236..790ccdbc6 100644
--- a/src/lua_baselib.c
+++ b/src/lua_baselib.c
@@ -1372,7 +1372,7 @@ static int lib_pSpawnGhostMobj(lua_State *L)
 	INLEVEL
 	if (!mobj)
 		return LUA_ErrInvalid(L, "mobj_t");
-	LUA_PushUserdata(L, P_SpawnGhostMobj(mobj), META_MOBJ);
+	LUA_PushUserdata(L, P_SpawnGhostMobjEX(mobj, lua_compatmode), META_MOBJ);
 	return 1;
 }
 
diff --git a/src/lua_mobjlib.c b/src/lua_mobjlib.c
index a58b2c581..c1ad48ab2 100644
--- a/src/lua_mobjlib.c
+++ b/src/lua_mobjlib.c
@@ -615,6 +615,23 @@ static int mobj_get(lua_State *L)
 	return 1;
 }
 
+static inline UINT32 eflags_vischeck(UINT32 eflags)
+{
+	UINT8 playerhide;
+
+	playerhide = 0;
+	if (eflags & RF_DONTDRAW)
+	{
+		// Visibility checks are necessary
+		playerhide = (UINT8)((eflags & RF_DONTDRAW) >> RF_HIDESHIFT);
+
+		// Hiding is the opposite of visibility.
+		playerhide = (~playerhide) & 0x0F;
+	}
+
+	return ((UINT32)(playerhide) << RF_HIDESHIFT);
+}
+
 #define NOSET luaL_error(L, LUA_QL("mobj_t") " field " LUA_QS " should not be set directly.", mobj_opt[field])
 #define NOSETPOS luaL_error(L, LUA_QL("mobj_t") " field " LUA_QS " should not be set directly. Use " LUA_QL("P_Move") ", " LUA_QL("P_TryMove") ", or " LUA_QL("P_SetOrigin") ", or " LUA_QL("P_MoveOrigin") " instead.", mobj_opt[field])
 static int mobj_set(lua_State *L)
@@ -838,8 +855,19 @@ static int mobj_set(lua_State *L)
 	case mobj_eflags:
 	{
 		UINT32 eflags = luaL_checkinteger(L, 3);
+		UINT32 visflags = 0;
 		if (lua_compatmode)
-			mo->renderflags = (mo->renderflags & ~RF_DONTDRAW) | (~eflags & RF_DONTDRAW); // eeeyup.
+		{
+			// eeeyup.
+			// Mhm. Yeah.
+			visflags = eflags_vischeck(eflags);
+
+			if ((visflags) && ((mo->renderflags & RF_DONTDRAW) != RF_DONTDRAW))
+			{
+				mo->renderflags &= ~RF_DONTDRAW;
+				mo->renderflags |= visflags;
+			}
+		}
 		mo->eflags = (UINT16)eflags;
 		break;
 	}
diff --git a/src/p_local.h b/src/p_local.h
index 885b66ea5..54be8014e 100644
--- a/src/p_local.h
+++ b/src/p_local.h
@@ -200,7 +200,8 @@ boolean P_PlayerHitFloor(player_t *player, boolean fromAir);
 void P_SetObjectMomZ(mobj_t *mo, fixed_t value, boolean relative);
 void P_RestoreMusic(player_t *player);
 boolean P_EndingMusic(player_t *player);
-mobj_t *P_SpawnGhostMobj(mobj_t *mobj);
+mobj_t *P_SpawnGhostMobjEX(mobj_t *mobj, boolean legacy);
+#define P_SpawnGhostMobj(mobj) P_SpawnGhostMobjEX(mobj, false)
 INT32 P_GivePlayerRings(player_t *player, INT32 num_rings);
 void P_GivePlayerLives(player_t *player, INT32 numlives);
 UINT8 P_GetNextEmerald(void);
diff --git a/src/p_mobj.c b/src/p_mobj.c
index 644bf1d9a..15da50e6c 100644
--- a/src/p_mobj.c
+++ b/src/p_mobj.c
@@ -10561,7 +10561,7 @@ void P_MobjThinker(mobj_t *mobj)
 				}
 			}
 		}
-		else
+		else if (mobj->extravalue3 <= 0) // Legacy mode bypasses this visibility system.
 		{
 			UINT32 dur = (mobj->flags2 & MF2_BOSSNOTRAP)
 				? (2*mobj->fuse)/3
diff --git a/src/p_user.c b/src/p_user.c
index e977f9ba4..dbc18e1fa 100644
--- a/src/p_user.c
+++ b/src/p_user.c
@@ -1182,11 +1182,11 @@ boolean P_IsDisplayPlayer(player_t *player)
 }
 
 //
-// P_SpawnGhostMobj
+// P_SpawnGhostMobjEX
 //
-// Spawns a ghost object on the player
+// Spawns a ghost object on the player. Has an option for "legacy mode".
 //
-mobj_t *P_SpawnGhostMobj(mobj_t *mobj)
+mobj_t *P_SpawnGhostMobjEX(mobj_t *mobj, boolean legacy)
 {
 	mobj_t *ghost = P_SpawnMobj(mobj->x, mobj->y, mobj->z, MT_GHOST);
 
@@ -1264,6 +1264,12 @@ mobj_t *P_SpawnGhostMobj(mobj_t *mobj)
 	ghost->old_spritexoffset = mobj->old_spritexoffset2;
 	ghost->old_spriteyoffset = mobj->old_spriteyoffset2;
 
+	// Legacy mode
+	if (legacy)
+	{
+		ghost->extravalue3 = 1;
+	}
+
 	return ghost;
 }
 
diff --git a/src/r_defs.h b/src/r_defs.h
index 0d70653e9..f0720b491 100644
--- a/src/r_defs.h
+++ b/src/r_defs.h
@@ -1021,11 +1021,12 @@ typedef enum
 	RF_ABSOLUTELIGHTLEVEL = 0x00010000, //  mobj_t.lightlevel is absolute instead of relative
 	RF_HIDEINSKYBOX       = 0x00020000, //  do not render in skybox
 
-	RF_DONTDRAW         = 0x00F00000,   // --Don't generate a vissprite
-	RF_DONTDRAWP1       = 0x00100000,   // No P1
-	RF_DONTDRAWP2       = 0x00200000,   // No P2
-	RF_DONTDRAWP3       = 0x00400000,   // No P3
-	RF_DONTDRAWP4       = 0x00800000,   // No P4
+	RF_HIDESHIFT        = (20),
+	RF_DONTDRAW         = 0x0F << RF_HIDESHIFT,   // --Don't generate a vissprite
+	RF_DONTDRAWP1       = 0x01 << RF_HIDESHIFT,   // No P1
+	RF_DONTDRAWP2       = 0x02 << RF_HIDESHIFT,   // No P2
+	RF_DONTDRAWP3       = 0x04 << RF_HIDESHIFT,   // No P3
+	RF_DONTDRAWP4       = 0x08 << RF_HIDESHIFT,   // No P4
 
 	RF_BLENDMASK       	= 0x07000000,   // --Blending override - see patchalphastyle_t
 	RF_BLENDSHIFT		= (6*4),