diff --git a/src/scripting/backend/codegen.cpp b/src/scripting/backend/codegen.cpp
index 99b83ceae..0ec7c1381 100644
--- a/src/scripting/backend/codegen.cpp
+++ b/src/scripting/backend/codegen.cpp
@@ -6750,7 +6750,7 @@ bool FxStructMember::RequestAddress(FCompileContext &ctx, bool *writable)
 			if (ctx.Function)
 			{
 				outerflags = ctx.Function->Variants[0].Flags;
-				if ((outerflags & (VARF_VirtualScope | VARF_Virtual)) && ctx.Class)
+				if (((outerflags & (VARF_VirtualScope | VARF_Virtual)) == (VARF_VirtualScope | VARF_Virtual)) && ctx.Class)
 					outerflags = FScopeBarrier::FlagsFromSide(FScopeBarrier::SideFromObjectFlags(ctx.Class->ObjectFlags));
 			}
 			FScopeBarrier scopeBarrier(outerflags, FScopeBarrier::FlagsFromSide(BarrierSide), "<unknown>");
@@ -6794,7 +6794,7 @@ FxExpression *FxStructMember::Resolve(FCompileContext &ctx)
 	if (ctx.Function)
 	{
 		outerflags = ctx.Function->Variants[0].Flags;
-		if ((outerflags & (VARF_VirtualScope | VARF_Virtual)) && ctx.Class)
+		if (((outerflags & (VARF_VirtualScope | VARF_Virtual)) == (VARF_VirtualScope | VARF_Virtual)) && ctx.Class)
 			outerflags = FScopeBarrier::FlagsFromSide(FScopeBarrier::SideFromObjectFlags(ctx.Class->ObjectFlags));
 	}
 	FScopeBarrier scopeBarrier(outerflags, membervar->Flags, membervar->SymbolName.GetChars());
@@ -8065,7 +8065,7 @@ isresolved:
 	if (ctx.Function)
 	{
 		outerflags = ctx.Function->Variants[0].Flags;
-		if ((outerflags & (VARF_VirtualScope | VARF_Virtual)) && ctx.Class)
+		if (((outerflags & (VARF_VirtualScope | VARF_Virtual)) == (VARF_VirtualScope | VARF_Virtual)) && ctx.Class)
 			outerflags = FScopeBarrier::FlagsFromSide(FScopeBarrier::SideFromObjectFlags(ctx.Class->ObjectFlags));
 	}
 	int innerflags = afd->Variants[0].Flags;
diff --git a/src/scripting/vm/vm.h b/src/scripting/vm/vm.h
index ba1db7aa9..b13f17777 100644
--- a/src/scripting/vm/vm.h
+++ b/src/scripting/vm/vm.h
@@ -708,7 +708,7 @@ public:
 	bool Final = false;				// cannot be overridden
 	bool Unsafe = false;			// Contains references to class fields that are unsafe for psp and item state calls.
 	bool FuncConst = false;			// [ZZ] readonly function
-	int BarrierSide = -1;			// [ZZ] FScopeBarrier::Side
+	int BarrierSide = 0;			// [ZZ] FScopeBarrier::Side
 	BYTE ImplicitArgs = 0;	// either 0 for static, 1 for method or 3 for action
 	unsigned VirtualIndex = ~0u;
 	FName Name;
diff --git a/src/scripting/zscript/zcc_compile.cpp b/src/scripting/zscript/zcc_compile.cpp
index c19d14b1e..0cfd2d66a 100644
--- a/src/scripting/zscript/zcc_compile.cpp
+++ b/src/scripting/zscript/zcc_compile.cpp
@@ -1081,8 +1081,8 @@ bool ZCCCompiler::CompileFields(PStruct *type, TArray<ZCC_VarDeclarator *> &Fiel
 
 		// For structs only allow 'deprecated', for classes exclude function qualifiers.
 		int notallowed = forstruct? 
-			ZCC_Latent | ZCC_Final | ZCC_Action | ZCC_Static | ZCC_FuncConst | ZCC_Abstract | ZCC_Virtual | ZCC_Override | ZCC_Meta | ZCC_Extension :
-			ZCC_Latent | ZCC_Final | ZCC_Action | ZCC_Static | ZCC_FuncConst | ZCC_Abstract | ZCC_Virtual | ZCC_Override | ZCC_Extension;
+			ZCC_Latent | ZCC_Final | ZCC_Action | ZCC_Static | ZCC_FuncConst | ZCC_Abstract | ZCC_Virtual | ZCC_Override | ZCC_Meta | ZCC_Extension | ZCC_VirtualScope :
+			ZCC_Latent | ZCC_Final | ZCC_Action | ZCC_Static | ZCC_FuncConst | ZCC_Abstract | ZCC_Virtual | ZCC_Override | ZCC_Extension | ZCC_VirtualScope;
 
 		if (field->Flags & notallowed)
 		{
@@ -1102,11 +1102,11 @@ bool ZCCCompiler::CompileFields(PStruct *type, TArray<ZCC_VarDeclarator *> &Fiel
 		if (type->ObjectFlags & OF_Play)
 			varflags |= VARF_Play;
 		if (field->Flags & ZCC_UIFlag)
-			varflags = (varflags&~VARF_Play) | VARF_UI;
+			varflags = FScopeBarrier::ChangeSideInFlags(varflags, FScopeBarrier::Side_UI);
 		if (field->Flags & ZCC_Play)
-			varflags = (varflags&~VARF_UI) | VARF_Play;
+			varflags = FScopeBarrier::ChangeSideInFlags(varflags, FScopeBarrier::Side_Play);
 		if (field->Flags & ZCC_ClearScope)
-			varflags = (varflags&~(VARF_UI | VARF_Play));
+			varflags = FScopeBarrier::ChangeSideInFlags(varflags, FScopeBarrier::Side_PlainData);
 
 		if (field->Flags & ZCC_Native)
 		{
@@ -2128,7 +2128,7 @@ void ZCCCompiler::CompileFunction(ZCC_StructWork *c, ZCC_FuncDeclarator *f, bool
 		if (c->Type()->ObjectFlags & OF_Play)
 			varflags |= VARF_Play;
 		if (f->Flags & ZCC_FuncConst)
-			varflags = (varflags&~(VARF_Play | VARF_UI)); // const implies clearscope. this is checked a bit later to also not have ZCC_Play/ZCC_UIFlag.
+			varflags = FScopeBarrier::ChangeSideInFlags(varflags, FScopeBarrier::Side_PlainData); // const implies clearscope. this is checked a bit later to also not have ZCC_Play/ZCC_UIFlag.
 		if (f->Flags & ZCC_UIFlag)
 			varflags = FScopeBarrier::ChangeSideInFlags(varflags, FScopeBarrier::Side_UI);
 		if (f->Flags & ZCC_Play)
diff --git a/wadsrc/static/zscript/inventory/inventory.txt b/wadsrc/static/zscript/inventory/inventory.txt
index 28b20cdd5..f24a2de09 100644
--- a/wadsrc/static/zscript/inventory/inventory.txt
+++ b/wadsrc/static/zscript/inventory/inventory.txt
@@ -813,7 +813,7 @@ class Inventory : Actor native
 	//
 	//===========================================================================
 
-	virtual bool DrawPowerup(int x, int y) { return false; }
+	virtual ui bool DrawPowerup(int x, int y) { return false; }
 
 	//===========================================================================
 	//
diff --git a/wadsrc/static/zscript/inventory/powerups.txt b/wadsrc/static/zscript/inventory/powerups.txt
index d355a5e14..df0812355 100644
--- a/wadsrc/static/zscript/inventory/powerups.txt
+++ b/wadsrc/static/zscript/inventory/powerups.txt
@@ -934,7 +934,7 @@ class PowerFlight : Powerup
 		+INVENTORY.HUBPOWER
 	}
 
-	bool HitCenterFrame;
+	ui bool HitCenterFrame;
 
 	//===========================================================================
 	//