Custom language dynamic plugin unload failed because of the ImageDataByPathResourceLoader

I'm now working on a custom language plugin, just registered a file type and file icon, following the tutorial [Custom Language Support Tutorial-2. Language and File Type](https://plugins.jetbrains.com/docs/intellij/language-and-filetype.html#register-the-file-type).

Dynamic Plugin seems not working if I unload my plugin. I'v followed the throubleshooting and found that it's because of the ImageDataByPathResourceLoader, but I don't know how to resolve this.

Here is how I defined my file icon:

public static final Icon FILE = IconLoader.getIcon("/icons/file.svg", MyIcons.class);

I tried to remove the file icon and return null in my LanguageFileType#getIcon() method, after that dynamic plugin works fine.

My idea version: Idea community 2025.1.4.1

Platform Version: IC-2025.1

Below is my idea.log file:

2025-07-27 16:29:41,797 [  48930]   INFO - #c.i.i.p.DynamicPlugins - Snapshot analysis result: Root 1:
  ROOT: Global JNI
  (root): com.intellij.openapi.wm.impl.IdeFrameImpl
  inputContext: sun.awt.im.InputMethodContext
  currentClientComponent: com.intellij.ide.projectView.impl.ProjectViewPane$MyProjectViewTree
  treeModel: com.intellij.ui.tree.AsyncTreeModel
  tree: com.intellij.ui.tree.AsyncTreeModel$Tree
  map: java.util.HashMap
  table: java.util.HashMap$Node[]
  []: java.util.HashMap$Node
  key: com.intellij.ui.tree.StructureTreeModel$Node
  userObject: com.intellij.ide.projectView.impl.nodes.PsiFileNode
  myClosedIcon: com.intellij.ui.RowIcon
  icons: javax.swing.Icon[]
  []: com.intellij.ui.icons.CachedImageIcon
  originalLoader: com.intellij.ui.icons.ImageDataByPathResourceLoader
* classLoader: com.intellij.ide.plugins.cl.PluginClassLoader


2025-07-27 16:29:41,807 [  48940]   INFO - #c.i.i.p.DynamicPlugins - Plugin xx is not unload-safe because class loader cannot be unloaded. Memory snapshot created at D:\Users\xx/unload-xx-27.07.2025_16.29.36.hprof