IconLoader requires restart IDE if uninstall or update plugin?

I'm now working on dynamic plugins following this guide: https://plugins.jetbrains.com/docs/intellij/dynamic-plugins.html

But I was in trouble after met all restrictions, my IDE still ask for restart when I uninstall my plugin. So I followed the troubleshooting and I'm confused about:

7. Every one of them is a memory leak (or part of a memory leak) that needs to be resolved.

Is that means the incoming references?

If so, I found out that there is a reference from IconLoader$ImageDataResolverImpl, is this the cause that I can't uninstall plugin without restart IDE? And how could I resolve this? Here is my icon class:

public interface MyIcons {

    Icon FILE_BLUE = IconLoader.getIcon("/icons/file_blue.svg", MyIcons.class);
    Icon FILE_GREEN = IconLoader.getIcon("/icons/file_green.svg", MyIcons.class);

    Icon ENUM = IconLoader.getIcon("/icons/enum.svg", MyIcons.class);
    Icon CLASS = IconLoader.getIcon("/icons/class.svg", MyIcons.class);
    Icon SERVICE = IconLoader.getIcon("/icons/service.svg", MyIcons.class);

    Icon FIELD = PlatformIcons.FIELD_ICON;
    Icon ENUM_VALUE = PlatformIcons.FIELD_ICON;
    Icon METHOD = PlatformIcons.METHOD_ICON;
}

By the way, I tried to replace IconLoader.getIconwith PlatformIcons to check if this is the problem, and eventually I can uninstall with out restart...

And here is my incoming references and path to GC Roots:

I really have no idea how to resolve this, please help...