Custom FileType icon and filename disappear from Project View after some time

I created Custom Language Support plugin based on tutorial (

For my FileType I reuse StdFileTypes.PLAIN_TEXT.getIcon() like

The problem that after some time working in IDE, icons and filenames of my custom language disapper from Project View.
Screenshot at Jun 09 17-46-45.png

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Does this happen after using some refactorings/moves of (other) files? Do they re-appear after closing and re-expanding parent node in view?


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