diff --git a/OpenRA.Mods.Common/Traits/Crates/GrantUpgradeCrateAction.cs b/OpenRA.Mods.Common/Traits/Crates/GrantUpgradeCrateAction.cs
index 9db05ff227..7af55fa76c 100644
--- a/OpenRA.Mods.Common/Traits/Crates/GrantUpgradeCrateAction.cs
+++ b/OpenRA.Mods.Common/Traits/Crates/GrantUpgradeCrateAction.cs
@@ -47,7 +47,8 @@ namespace OpenRA.Mods.Common.Traits
 		bool AcceptsUpgrade(Actor a)
 		{
 			var um = a.TraitOrDefault<UpgradeManager>();
-			return um != null && info.Upgrades.Any(u => um.AcceptsUpgrade(a, u));
+			return um != null && (info.Duration > 0 ?
+				info.Upgrades.Any(u => um.AcknowledgesUpgrade(a, u)) : info.Upgrades.Any(u => um.AcceptsUpgrade(a, u)));
 		}
 
 		public override int GetSelectionShares(Actor collector)
@@ -73,13 +74,16 @@ namespace OpenRA.Mods.Common.Traits
 					var um = a.TraitOrDefault<UpgradeManager>();
 					foreach (var u in info.Upgrades)
 					{
-						if (!um.AcceptsUpgrade(a, u))
-							continue;
-
 						if (info.Duration > 0)
-							um.GrantTimedUpgrade(a, u, info.Duration);
+						{
+							if (um.AcknowledgesUpgrade(a, u))
+								um.GrantTimedUpgrade(a, u, info.Duration);
+						}
 						else
-							um.GrantUpgrade(a, u, this);
+						{
+							if (um.AcceptsUpgrade(a, u))
+								um.GrantUpgrade(a, u, this);
+						}
 					}
 				}
 			});
diff --git a/OpenRA.Mods.Common/Traits/SupportPowers/GrantUpgradePower.cs b/OpenRA.Mods.Common/Traits/SupportPowers/GrantUpgradePower.cs
index e78e5822cd..1e7f7a1109 100644
--- a/OpenRA.Mods.Common/Traits/SupportPowers/GrantUpgradePower.cs
+++ b/OpenRA.Mods.Common/Traits/SupportPowers/GrantUpgradePower.cs
@@ -65,13 +65,16 @@ namespace OpenRA.Mods.Common.Traits
 
 				foreach (var u in info.Upgrades)
 				{
-					if (!um.AcceptsUpgrade(a, u))
-						continue;
-
 					if (info.Duration > 0)
-						um.GrantTimedUpgrade(a, u, info.Duration);
+					{
+						if (um.AcknowledgesUpgrade(a, u))
+							um.GrantTimedUpgrade(a, u, info.Duration);
+					}
 					else
-						um.GrantUpgrade(a, u, this);
+					{
+						if (um.AcceptsUpgrade(a, u))
+							um.GrantUpgrade(a, u, this);
+					}
 				}
 			}
 		}
@@ -90,7 +93,8 @@ namespace OpenRA.Mods.Common.Traits
 					return false;
 
 				var um = a.TraitOrDefault<UpgradeManager>();
-				return um != null && info.Upgrades.Any(u => um.AcceptsUpgrade(a, u));
+				return um != null && (info.Duration > 0 ?
+					info.Upgrades.Any(u => um.AcknowledgesUpgrade(a, u)) : info.Upgrades.Any(u => um.AcceptsUpgrade(a, u)));
 			});
 		}
 
diff --git a/OpenRA.Mods.Common/Traits/Upgrades/UpgradeActorsNear.cs b/OpenRA.Mods.Common/Traits/Upgrades/UpgradeActorsNear.cs
index adadbb936e..9fbe748e11 100644
--- a/OpenRA.Mods.Common/Traits/Upgrades/UpgradeActorsNear.cs
+++ b/OpenRA.Mods.Common/Traits/Upgrades/UpgradeActorsNear.cs
@@ -116,7 +116,7 @@ namespace OpenRA.Mods.Common.Traits
 				var um = produced.TraitOrDefault<UpgradeManager>();
 				if (um != null)
 					foreach (var u in info.Upgrades)
-						if (um.AcceptsUpgrade(produced, u))
+						if (um.AcknowledgesUpgrade(produced, u))
 							um.GrantTimedUpgrade(produced, u, 1);
 			}
 		}
diff --git a/mods/ra/rules/defaults.yaml b/mods/ra/rules/defaults.yaml
index f90fd9582c..a832ead541 100644
--- a/mods/ra/rules/defaults.yaml
+++ b/mods/ra/rules/defaults.yaml
@@ -55,7 +55,7 @@
 		UpgradeMinEnabledLevel: 1
 	DamageMultiplier@IRONCURTAIN:
 		UpgradeTypes: invulnerability
-		Modifier: 0, 0
+		Modifier: 0
 	TimedUpgradeBar:
 		Upgrade: invulnerability
 
diff --git a/mods/ts/rules/defaults.yaml b/mods/ts/rules/defaults.yaml
index 3f3ac37626..6d77dc4077 100644
--- a/mods/ts/rules/defaults.yaml
+++ b/mods/ts/rules/defaults.yaml
@@ -359,12 +359,10 @@
 	UpgradeOverlay@EMPDISABLE:
 		UpgradeTypes: empdisable
 		UpgradeMinEnabledLevel: 1
-		UpgradeMaxAcceptedLevel: 2
 		Palette: disabled
 	DisableUpgrade@EMPDISABLE:
 		UpgradeTypes: empdisable
 		UpgradeMinEnabledLevel: 1
-		UpgradeMaxAcceptedLevel: 2
 	TimedUpgradeBar@EMPDISABLE:
 		Upgrade: empdisable
 		Color: 255,255,255
@@ -377,11 +375,9 @@
 		ShowToEnemies: true
 		ZOffset: 512
 		UpgradeMinEnabledLevel: 1
-		UpgradeMaxAcceptedLevel: 2
 	Cloak@CLOAKGENERATOR:
 		UpgradeTypes: cloakgenerator
 		UpgradeMinEnabledLevel: 1
-		UpgradeMaxAcceptedLevel: 2
 		InitialDelay: 0
 		CloakDelay: 90
 	MustBeDestroyed: