Bug Report

While playing on multiplayer the SevTech modpack on latest version there's an issue that allows you to duplicate crafting output of the crafting station (Tinkers' Construct).

Expected Behaviour

More people can get the same output from a single craft instead of getting only one.

Possible Solution

I think the problem can be the absence of an additional check at the moment of clicking the output to get it. Maybe adding a check to know if the materials requested for the craft i'm currently clicking are still there it will solve the problem.

Steps to Reproduce (for bugs)

We found that bug while playing as 2 and in order to make it 100% of the time (tested) we split the role into player A and player B:

1. A) put the materials to do a craft, but instead of take the result just wait with the opened window
2. B) only when an output can already be produced (so a recipe is correct, no matter which one) open the crafting station and just take the reward
3. A) now A can see that B use all the materials but can still get the crafting result, if you just grab it in your inventory (or into the crafting station-linked nearby chest) you receive the item and you can use it like if you get it normally.

Logs

• Client/Server Log:
• Crash Log: -

Client Information

• Modpack Version: Latest
• Java Version: 8
• Launcher Used: AT-Launcher
• Memory Allocated: 8 Gb
• Server/LAN/Single Player: Multiplayer on GameHosting server
• Optifine Installed: No
• Shaders Enabled: No

World Information

• Modpack Version world created in: latest, world created 2 weeks ago

• Additional Content Installed: No

Server Information

• Java Version: java8.jar
• Operating System: unknown
• Hoster/Hosting Solution: gamehosting
• Sponge (Non-Vanilla Forge) Server: -

Sorry to be pedantic, but latest is not a version. We need to know the number as there are currently two that people refer to as latest. 3.0.8 is the latest "release", but 3.1.1 is currently in public beta and is the latest version of the pack available.

Oh ok, sorry :)
Modpack Version: 3.1.1

I think what you can do is to post this issue on tinkers construct's issues page.

This seems to be SlimeKnights/TinkersConstruct#3714
I believe it's fixed in the latest 1.12 version of tinkers, but I haven't tested this.