❗ Checklist

• I am using the official english version of Slimefun and did not modify the jar.
• I downloaded the official version from the new build site Blob Builds.
• I am using an up to date "DEV" (not "RC") version of Slimefun.
• I am aware that issues related to Slimefun addons need to be reported on their bug trackers and not here.
• I searched for similar open issues and could not find an existing bug report on this.

📍 Description

a player reported to me that he managed to get one backpack inside another, using the F key,
the backpack can be put on and taken off in an endless cycle

player report: the backpack you want to keep in your main hand (I'll call it backpack 2), hold both at the same time, when you click to open it, it will open backpack 1, then you use the F key to put backpack 2 in the second hand, and put the mouse over some slot in backpack 1 and click F again.

📑 Reproduction Steps

https://www.youtube.com/watch?v=6U5TMU6id1M

💡 Expected Behavior

the backpack doesn't go inside each other, the good thing would be to make it so that whenever a backpack goes inside another it detects that it's a backpack and automatically deletes it.

📷 Screenshots / Videos

No response

📜 Server Log

No response

📂 /error-reports/ folder

No response

💻 Server Software

Purpur

🎮 Minecraft Version

1.20.x

⭐ Slimefun version

https://prnt.sc/gduKwYgfGTwf

🧭 Other plugins

No response