diff --git a/Content.Client/DoAfter/UI/DoAfterGui.cs b/Content.Client/DoAfter/UI/DoAfterGui.cs
index 2e6a5076c9..1b7b2d4da9 100644
--- a/Content.Client/DoAfter/UI/DoAfterGui.cs
+++ b/Content.Client/DoAfter/UI/DoAfterGui.cs
@@ -146,7 +146,13 @@ namespace Content.Client.DoAfter.UI
         {
             base.FrameUpdate(args);
 
-            if (AttachedEntity?.IsValid() != true ||
+            IEntity? tempQualifier = AttachedEntity;
+            if (tempQualifier != null)
+            {
+                IoCManager.Resolve<IEntityManager>().EntityExists(tempQualifier.Uid);
+            }
+
+            if (RETURNED_VALUE != true ||
                 !AttachedEntity.TryGetComponent(out DoAfterComponent? doAfterComponent))
             {
                 Visible = false;
diff --git a/Content.Client/IconSmoothing/IconSmoothSystem.cs b/Content.Client/IconSmoothing/IconSmoothSystem.cs
index eefbc01e8a..3ad65b1727 100644
--- a/Content.Client/IconSmoothing/IconSmoothSystem.cs
+++ b/Content.Client/IconSmoothing/IconSmoothSystem.cs
@@ -51,7 +51,7 @@ namespace Content.Client.IconSmoothing
             // Yes, we updates ALL smoothing entities surrounding us even if they would never smooth with us.
             // This is simpler to implement. If you want to optimize it be my guest.
             var senderEnt = ev.Sender;
-            if (senderEnt.IsValid() &&
+            if (IoCManager.Resolve<IEntityManager>().EntityExists(senderEnt.Uid) &&
                 _mapManager.TryGetGrid(senderEnt.Transform.GridID, out var grid1) &&
                 senderEnt.TryGetComponent(out IconSmoothComponent? iconSmooth)
                 && iconSmooth.Running)
diff --git a/Content.IntegrationTests/Tests/MindEntityDeletionTest.cs b/Content.IntegrationTests/Tests/MindEntityDeletionTest.cs
index f63a7d100a..edfa665574 100644
--- a/Content.IntegrationTests/Tests/MindEntityDeletionTest.cs
+++ b/Content.IntegrationTests/Tests/MindEntityDeletionTest.cs
@@ -98,7 +98,7 @@ namespace Content.IntegrationTests.Tests
 
             server.Assert(() =>
             {
-                Assert.That(mind.CurrentEntity.IsValid(), Is.True);
+                Assert.That(IoCManager.Resolve<IEntityManager>().EntityExists(mind.CurrentEntity.Uid), Is.True);
             });
 
             await server.WaitIdleAsync();
@@ -149,7 +149,7 @@ namespace Content.IntegrationTests.Tests
 
             server.Assert(() =>
             {
-                Assert.That(mind.CurrentEntity.IsValid(), Is.True);
+                Assert.That(IoCManager.Resolve<IEntityManager>().EntityExists(mind.CurrentEntity.Uid), Is.True);
                 Assert.That(mind.CurrentEntity, Is.Not.EqualTo(playerEnt));
             });
 
diff --git a/Content.Server/Cargo/Components/CargoConsoleComponent.cs b/Content.Server/Cargo/Components/CargoConsoleComponent.cs
index cf9636635f..a5fe03a8c4 100644
--- a/Content.Server/Cargo/Components/CargoConsoleComponent.cs
+++ b/Content.Server/Cargo/Components/CargoConsoleComponent.cs
@@ -201,7 +201,7 @@ namespace Content.Server.Cargo.Components
 
         private void UpdateUIState()
         {
-            if (_bankAccount == null || !Owner.IsValid())
+            if (_bankAccount == null || !IoCManager.Resolve<IEntityManager>().EntityExists(Owner.Uid))
             {
                 return;
             }
diff --git a/Content.Server/Hands/Systems/HandsSystem.cs b/Content.Server/Hands/Systems/HandsSystem.cs
index 640214e96c..6c2c10156f 100644
--- a/Content.Server/Hands/Systems/HandsSystem.cs
+++ b/Content.Server/Hands/Systems/HandsSystem.cs
@@ -191,7 +191,7 @@ namespace Content.Server.Hands.Systems
 
             var playerEnt = playerSession.AttachedEntity;
 
-            if (playerEnt == null || !playerEnt.IsValid())
+            if (playerEnt == null || !IoCManager.Resolve<IEntityManager>().EntityExists(playerEnt.Uid))
                 return false;
 
             return playerEnt.TryGetComponent(out hands);
@@ -221,7 +221,7 @@ namespace Content.Server.Hands.Systems
             var playerEnt = playerSession.AttachedEntity;
 
             if (playerEnt == null ||
-                !playerEnt.IsValid() ||
+                !IoCManager.Resolve<IEntityManager>().EntityExists(playerEnt.Uid) ||
                 playerEnt.IsInContainer() ||
                 !playerEnt.TryGetComponent(out SharedHandsComponent? hands) ||
                 !hands.TryGetActiveHeldEntity(out var throwEnt) ||
@@ -269,7 +269,7 @@ namespace Content.Server.Hands.Systems
 
             var plyEnt = playerSession.AttachedEntity;
 
-            if (plyEnt == null || !plyEnt.IsValid())
+            if (plyEnt == null || !IoCManager.Resolve<IEntityManager>().EntityExists(plyEnt.Uid))
                 return;
 
             if (!plyEnt.TryGetComponent(out SharedHandsComponent? hands) ||
diff --git a/Content.Server/Interaction/InteractionSystem.cs b/Content.Server/Interaction/InteractionSystem.cs
index 5b74ecba43..516d8e8f55 100644
--- a/Content.Server/Interaction/InteractionSystem.cs
+++ b/Content.Server/Interaction/InteractionSystem.cs
@@ -90,7 +90,7 @@ namespace Content.Server.Interaction
 
             userEntity = ((IPlayerSession?) session)?.AttachedEntity;
 
-            if (userEntity == null || !userEntity.IsValid())
+            if (userEntity == null || !IoCManager.Resolve<IEntityManager>().EntityExists(userEntity.Uid))
             {
                 Logger.WarningS("system.interaction",
                     $"Client sent interaction with no attached entity. Session={session}");
diff --git a/Content.Server/Storage/EntitySystems/StorageSystem.cs b/Content.Server/Storage/EntitySystems/StorageSystem.cs
index 6ffe397bcd..408b63a9f9 100644
--- a/Content.Server/Storage/EntitySystems/StorageSystem.cs
+++ b/Content.Server/Storage/EntitySystems/StorageSystem.cs
@@ -151,7 +151,7 @@ namespace Content.Server.Storage.EntitySystems
                 var attachedEntity = session.AttachedEntity;
 
                 // The component manages the set of sessions, so this invalid session should be removed soon.
-                if (attachedEntity == null || !attachedEntity.IsValid())
+                if (attachedEntity == null || !IoCManager.Resolve<IEntityManager>().EntityExists(attachedEntity.Uid))
                     continue;
 
                 if (storageMap != attachedEntity.Transform.MapID)
diff --git a/Content.Shared/Movement/EntitySystems/SharedMoverSystem.cs b/Content.Shared/Movement/EntitySystems/SharedMoverSystem.cs
index 176301087e..2accfda950 100644
--- a/Content.Shared/Movement/EntitySystems/SharedMoverSystem.cs
+++ b/Content.Shared/Movement/EntitySystems/SharedMoverSystem.cs
@@ -82,7 +82,7 @@ namespace Content.Shared.Movement.EntitySystems
 
             var ent = session?.AttachedEntity;
 
-            if (ent == null || !ent.IsValid())
+            if (ent == null || !IoCManager.Resolve<IEntityManager>().EntityExists(ent.Uid))
                 return false;
 
             if (!ent.TryGetComponent(out T? comp))