❗ 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

Breaking a BlockLocker sign that was placed from the offhand while holding a slimefun item causes the slimefun item to be duped.

📑 Reproduction Steps

1. Have BlockLocker installed
2. Put a sign into offhand
3. Place sign onto the side of a block (Any block will do)
4. Hold the slimefun item you want to duplicate in your main hand
5. Break the sign. Instead of the sign dropping, a duplicated slimefun item drops.

This only works with slimefun items

💡 Expected Behavior

slimefun items should not be duplicated in this manner.

📷 Screenshots / Videos

No response

📜 Server Log

No response

📂 /error-reports/ folder

No response

💻 Server Software

Purpur

🎮 Minecraft Version

1.17.x

⭐ Slimefun version

I know this isn't the latest version of slimefun, but I went through the changelogs for the versions I do not have and none of them address this issue. And given that it requires BlockLocker I am willing to bet it will work on the latest version regardless.

🧭 Other plugins

No response

I am aware I checked the up to date box even though I am not running the latest version. This bug will more than likely work on the latest build since no changelogs have addressed it.

This sounds like BlockPlaceEvent interference.
Which Slimefun items have you tried this with? The item is "placed" when it shouldn't be so when you break the sign Minecraft thinks the item is there and drops that (Minecraft is weird with block placements - for example, stripping a log "places" the axe on the log...), but we implement a NotPlaceable interface and handle with that so no item should ever get placed to begin with.
I definitely agree this should be happening with latest, tests can confirm that but eh.

I also see that BlockLocker is open source so that is handy, it seems there is no Discord though and that all bug reports are handled through GitHub/Spigot. I will see if I can get a hold of the dev to maybe help us figure out where to find possible conflicts.

Haven't found a pattern of what can be duped and what can't. Some testing has shown that Addons can be duped. Here is a video I uploaded showing how to do the dupe.

Tested this and can confirm

The item is "placed" when it shouldn't be

It seems like it. When placing a AContainer machine it will place down the machine to the BlockStorage and you still keep the item, when destroying the sign it will drop the duplicated item because Slimefun thinks that it is a BlockStorage.
EDIT: Video for clarification. https://youtu.be/2y2kkwvXuFs

Haven't found a pattern of what can be duped and what can't.

I just tried and it seems like everything that doesn't extend to NotPlaceable? (Need to test that more later) Even a sword works...

I just went through a few more items and still looks like possibly everything can be duped.

If you use a GPS Teleporter pylon the sign disappears and the pylon gets placed next to the block

It has been 10 days since I've opened an issue report on their GitHub and it's not even been acknowledged. Unfortunately I am gonna have to close this issue, and if they ever reply we can always reopen it.

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