Item dupe with backpacks and a big player profile

[TwinkleToes777]

❗ Checklist

• I am using the official english version of Slimefun and did not modify the jar.
• 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

An item dupe bug that can be done by opening backpack that was given by another player who has a huge player file (10.1MB), with hundreds of backpacks (599 to be exact)

📑 Reproduction Steps

Step 0: Restart server, ensures that other player's backpacks will be unloaded prior to starting the dupe process
Step 1: Open up a backpack of a person who has made a ton of backpacks with possibly a ton of items in them
Step 2: Server lags, after which the backpack will open
Step 3: Take items out of the backpack somewhat quickly, then close the interface or wait for it to refresh on its own
Step 4: Open the backpack again, which opens instantly without any lag assuming the interface was closed
Step 5: The original items that were taken out are both still in the backpack and your inventory, which means that the items were duped

💡 Expected Behavior

I expected items to not get duped

📷 Screenshots / Videos

No response

📜 Server Log

No response

📂 /error-reports/ folder

No response

💻 Server Software

Purpur

🎮 Minecraft Version

1.19.x

⭐ Slimefun version

This Server uses the following setup of Slimefun:
Purpur git-Purpur-1985 (MC: 1.19.4)
Slimefun Dev - 1136
Metrics-Module #29
Java 17
Installed Addons: (8)
Networks vDEV - 50 (git 3de3c9d6)
InfinityExpansion vDEV - 144 (git 9da37202)
SFCalc vDev - 38
MobCapturer vDEV - 33 (git 6fc26c35)
HotbarPets vDEV - 38 (git fa6c871d)
EcoPower vDEV - 5 (git 5c1ecd68)
FluffyMachines vDEV - 132 (git ccf029ba)
ExoticGarden vDEV - 78 (git 7f9a5f63)

🧭 Other plugins

No response

[Boomer-1]

there were some fixes today that could possibly stop this, as you had reported a lag issue. once that new dev version rolls out, please retest on the newer dev version

[J3fftw1]

They are on the new build

[Boomer-1]

didn't think it had reached blob.builds yet, thanks

[J3fftw1]

I can repro this bug very conisitently now.