Atelier Rorona Plus The Alchemist of Arland [BLES02050]

I have tried to do something with missing backgrounds in dialog screens and what I've found:
1. You CAN see backgrounds in a couple of cases:
a. In OpenGL mode.
b. In Vulkan mode with both "Write Color Buffers" and "Strict Rendering Mode" options enabled.
2. The backgrounds still not very good: they are reduced in size on a half (see a screenshot).
3. With "Write Color Buffers" option enabled game runs too slowly (15 fps instead of 60 without this option).