[HELP] Custom Crafting Table GUI Opens and Closes Immediately - NeoForge 1.21.4

Started by Sanya Lamhfheathoff on Mon, 08/04/2025 - 06:53

Topic category: Help with Minecraft modding (Java Edition)

MCreator Version: Latest
Forge/NeoForge Version: NeoForge 1.21.4 (21.4.137)
Minecraft Version: 1.21.4

I'm trying to create a custom crafting table block that opens a crafting GUI with a custom name ("Temporary Crafting Table"). The block is created using custom code in MCreator. However, the GUI opens for just a split second and then immediately closes.

I've implemented the block using custom Java code, replacing the default MCreator-generated code entirely. Here's my current implementation:

TemporaryCraftingTable

Then the server logs show that everything works correctly on the server side:

[Server thread/INFO] [Erflettmod/]: Opening crafting menu for player: Dev

[Server thread/INFO] [Erflettmod/]: Menu opened successfully

However, the GUI still closes immediately on the client side.

What I've tested:

Vanilla crafting table works perfectly: the issue is specific to custom blocks
Tried different approaches:
1. Using getMenuProvider() override
2. Extending CraftingTableBlock directly
3. Adding delays with level.getServer().execute()
4. Different InteractionResult return values
No other procedures or triggers are set in MCreator for this block
Disabled all MCreator-generated code and replaced with custom implementation

Setup of this block:

Created block element in MCreator
Disabled procedures and block entities
Opened the Java file and replaced all content with custom code
No "When right clicked" procedures set
No GUI elements configured in MCreator UI

I have four questions:

Is this a known issue with MCreator + NeoForge 1.21.4?
Should I use MCreator's GUI system instead of custom CraftingMenu?
Are there any specific MCreator settings that might interfere with custom GUI code?
Is there a client-server synchronization issue I'm missing?

Any help or suggestions would be greatly appreciated! The server-side logic works perfectly, but something prevents the client from keeping the GUI open.

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Should I use MCreator's GUI system instead of custom CraftingMenu?

If you use custom menu, there is a chance something is wrong in your code that causes it to close immediately

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Thank you for the suggestion about checking the custom menu code. I've conducted extensive debugging and found some very interesting results that point to a potential MCreator-specific bug with CraftingMenu.

Debug Results:

Test 1: Simple ChestMenu WORKS PERFECTLY

MenuProvider menuProvider = new SimpleMenuProvider(
    (id, inventory, p) -> ChestMenu.threeRows(id, inventory, new SimpleContainer(27)),
    Component.literal("Test GUI")
);

Opens and stays open normally, and no issues whatsoever

Test 2: CraftingMenu with detailed logging FAILS (Closes immediately)

Test2Code

Server logs show everything works perfectly

[Server thread/INFO] [Erflettmod/]: === DEBUG: Starting menu creation ===
[Server thread/INFO] [Erflettmod/]: ContainerLevelAccess created: net.minecraft.world.inventory.ContainerLevelAccess$2@7234d79
[Server thread/INFO] [Erflettmod/]: MenuProvider created: net.minecraft.world.SimpleMenuProvider@7bf5e2a3
[Server thread/INFO] [Erflettmod/]: Opening menu...
[Server thread/INFO] [Erflettmod/]: Creating CraftingMenu - ID: 2, Player: Dev
[Server thread/INFO] [Erflettmod/]: CraftingMenu created successfully: net.minecraft.world.inventory.CraftingMenu@3a8a1531
[Server thread/INFO] [Erflettmod/]: Menu opened successfully

Then, I also tried:

Different InteractionResult return values
Extending CraftingTableBlock directly
Using getMenuProvider() override method
Adding delays and explicit container closing
Manual synchronization attempts

All approaches failed with the same behavior; server-side works perfectly, client-side GUI closes immediately.

Key Findings:

Vanilla crafting table works perfectly
ChestMenu works perfectly in custom blocks
CraftingMenu fails ONLY in custom blocks
Server-side CraftingMenu creation is completely successful
Client-side synchronization appears to be broken

Environment Details:

MCreator Version: Latest
NeoForge: 1.21.4 (21.4.137)
Custom Code Approach, Replaced all MCreator-generated code
No other procedures/triggers set in MCreator
Single player testing environment

I think, this appears to be a client-server synchronisation bug specific to CraftingMenu in MCreator-generated custom blocks. The issue is not in the custom code itself (as evidenced by perfect server-side operation and working ChestMenu), but rather in how MCreator handles the network synchronisation for CraftingMenu specifically.

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