/mv version -p output

https://paste.gg/p/anonymous/eba01f44d0dc4306ac4dd2095b1927da

Server logs

https://paste.gg/p/anonymous/eedfb181a56a4f7cbeb2129a3b890002

Server Version

Paper version git-Paper-81 (MC: 1.19) (Implementing API version 1.19-R0.1-SNAPSHOT) (Git: 86f87ba)
You are running the latest version

Bug Description

Hello,

I hope you guys can help me.
My skyblock server is running out of memory all of the sudden.
When doing a summary heap, a plugin doing net.minecraft.core.BlockPosition takes up the memory. The file size keeps increasing everytime the server restarts,
By disabling every plugin one by one, the culprit is finally found, it is multiverse core. After disabling this, The file size dissapears and the leak/ memory is reduced by 8GB.

Heap summary

mv -p

Can someone help/explain to me what is going on? Why does multiverse keeps stacking net.minecraft.core.BlockPosition for 270k times?

P.s. 0 errors in console

Steps to reproduce

Use fabled skyblock and multiverse-core.

Watch file size grow after each restart

Agreements

• I have searched for and ensured there isn't already an open or resolved issue(s) regarding this.
• I was able to reproduce my issue on a freshly setup and up-to-date server with the latest version of Multiverse plugins with no other plugins and with no kinds of other server or client mods.

Somewhat wanting to blame FabledSkyblock here, despite the OP concluding MV-Core is to blame. I don't really think we make any use of BlockPosition, as we only really need Bukkit-compatible classes only.

Specifically for the fact that FabledSkyblock has a convertBlockToBlockData utility routine that you can see in-code here (line 486), which actively makes use of BlockPosition through some janky-looking reflection calls.

Seems like this should only happen when you are "saving a structure" using the structure save command. I don't know what that is from the FabledSkyblock's perspective (never used the plugin), but that's ultimately what ends up making this call.

I suspect this isn't an MV issue.

Oke, ty for your time. Please leave request open as I contact fabled skyblock to refer to this issue

You can close the ticket. After deleting multiverse, MV inventories and all world generated by MV. The issue continued to exist.