Describe the bug
So I want to create a minecraft modpack for my friends and I have 270+ mods and when I finish with the mods I started with an image for main menu with FacnyMenu and I put a background saved the Layout and when I exit the editors it still not showing my background but the changes I've done to the buttons (deleted and moved some of them) are showing like in editor.

I don't think you can reproduce this but here it is

1. Current menu --> Customization: On --> Layouts --> New.
2. I deleted some buttons and move some like in this print screen : https://prnt.sc/piatpLpHaaPx
3. Right Click on gray background --> set Background.
4. Select Background Image --> Choose Image --> Choose file --> second.png (my desire image) : https://prnt.sc/RH_gbmarHFZs

Screenshots
Here I am in editor layout : https://prnt.sc/e7IKpI8RvLgr
Here I am in normal minecraft menu : https://prnt.sc/GB0XJoODEyg8

Mod list kinda:
If you really want to see what mods I put in this modpack I will paste a txt file taken from a crash-log with all the mods.
TEST.txt

Specs:

• OS: Windows 10
• FancyMenu Version 2.14.9
• Forge 36.2.34
• Minecraft Version 1.16.5
• Active Mods : 274 mods

You have a mod installed that overrides the Vanilla menu background. You need to find this mod and disable its menu customizations or remove it. It's a mod conflict.

If you have more questions, please join the Discord: #569