Hi @Giedry Freitas,
Thanks for sharing the screenshots. The missing golden triangles might be related to an appearance or effect not being saved correctly, or a layer or object style that gets flattened or disabled when the file is reopened. Could you confirm if the golden areas were created with a gradient, pattern, or an overlay effect? It would also help to know which Illustrator version and OS you're working on, and if this issue happens only in this file or in others as well. Additionally, please let me know how and where you saved the file, whether on your system drive, cloud, or a network location.
Looking forward to your update.
Abhishek