Steps to reproduce
- Open example page with VisualEditor mode
- Edit the gallery with 3 images
- In gallery you see only 2 images. The image with percent encoded filename "Przej%C5%9Bcie_graniczne_U%C5%BChorod-Vy%C5%A1n%C3%A9_Nemeck%C3%A9.jpg" is not recognized.
- In consequence this valid image is removed after changing something