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The settings in Advanced Options | IDE Configuration | System | System Settings | Ignored Files is not used in cnd projects, always all files are shown.
Shown where? In what view? If you see these files in 'External Files' logical folder, it may be a NB bug. Have you tried to view the files from the Files panel? If yopu see them there, it's a NB bug.
The problem is with the "external/source files" logical folders in the project view. The files view and favorites view are ok (ignored files hidden).
problem confirmed.
*** This issue has been marked as a duplicate of 144975 ***