ECS Tag components causing issues?

[orchid tartan]

Heya - Working with Unity's ECS, and having some extremely weird problems with empty components.
When I apply a large number of empty components to entities all the other systems seem to act in a bizzare way as if there is a memory leak although there is no leak?

I'm declaring the component as follows. When using the component like this it's causing the above issue.

public struct CCompletedIntercept : IComponentData { }

When declaring the component with a dummy field the above issue is gone?

    public struct CCompletedIntercept : IComponentData
    {
        public bool dummy;
    }

[hushed bone]

you'll need to provide code you do and error (or whatever is wrong). Provided info is not enough