Question I want to change the component value of the child buffer's entity.

If A (CollisionEntity) and B (InstanceEntity) collide, write a code that changes the Material Color value of the Entities that exist as a sub-item of InstanceEntity and you are yourself. However, when I write and run that code, I get an error message. I know what's wrong with the code. Or please let me know how to send it from ECS.

Error Message:
"ArgumentException: System.ArgumentException: System.String Unity.Entities.EntityComponentStore::AppendRemovedComponentRecordError(Unity.Entities.Entity,Unity.Entities.ComponentType)
This Exception was thrown from a function compiled with Burst, which has limited exception support.
0x00007ffcc10b8e20 (968d884ed9caab83139827ecb3b0053)"

Code:
[UpdateInGroup(typeof(AfterPhysicsSystemGroup))]
public partial struct CollisionMaterialChangeSystem : ISystem
{
void OnCreate(ref SystemState state)
{
state.RequireForUpdate<CollisionEntity>();
}

public void OnUpdate(ref SystemState state)
{
var ecb = SystemAPI.GetSingleton<EndFixedStepSimulationEntityCommandBufferSystem.Singleton>()
.CreateCommandBuffer(state.WorldUnmanaged);

state.Dependency = new CollisionChangeColorJobTEMP
{
Ecb = ecb,
CollisionEntity = SystemAPI.GetComponentLookup<CollisionEntity>(),
InstanceEntity = SystemAPI.GetComponentLookup<InstanceEntity>(),
ChildEntity = SystemAPI.GetBufferLookup<Child>(),
}.Schedule(SystemAPI.GetSingleton<SimulationSingleton>(), state.Dependency);
}
}

public struct CollisionChangeColorJobTEMP : ICollisionEventsJob
{
public EntityCommandBuffer Ecb;
public ComponentLookup<CollisionEntity> CollisionEntity;
public ComponentLookup<InstanceEntity> InstanceEntity;
public BufferLookup<Child> ChildEntity;

public void Execute(CollisionEvent collisionEvent)
{
bool isCollisionEntityA = CollisionEntity.HasComponent(collisionEvent.EntityA);
bool isCollisionEntityB = CollisionEntity.HasComponent(collisionEvent.EntityB);

bool isInstanceEntityA = InstanceEntity.HasComponent(collisionEvent.EntityA);
bool isInstanceEntityB = InstanceEntity.HasComponent(collisionEvent.EntityB);

if (!(isCollisionEntityA ^ isCollisionEntityB)) return;
if (!(isInstanceEntityA ^ isInstanceEntityB)) return;

Entity instanceEntity;

if (isCollisionEntityA)
{
instanceEntity = collisionEvent.EntityB;
}
else
{
instanceEntity = collisionEvent.EntityA;
}

if (ChildEntity.HasBuffer(instanceEntity))
{
DynamicBuffer<Child> buffer;
if (ChildEntity.TryGetBuffer(instanceEntity, out buffer))
{
foreach (var child in buffer)
{
Ecb.SetComponent(child.Value, new URPMaterialPropertyBaseColor { Value = new float4(1, 0, 0, 1) });
}
}
}
}
}