Dynamic types emitted for IServices proxies

[kdma]

Describe the bug

This is more of a question because I am not sure if this is a bug.
Our cluster had memory leaks so I investigated a lot of memory dumps and fixed it.
At the moment the memory is no longer leaking but I've noticed that some services have a large memory footprint caused by the many IService proxied.
Example:

Is this the expected behaviour?
Are the types never unloaded?