TPing into certain chunks causes game crash

[BenRodkin]

Modpack version

1.1

Java version

1.8.0_431

RAM Allocated

2-8 GB dedicated, 16 GB on PC

Description

Using JourneyMap, I TPed into a chunk (that I had already visited) and was one or two chunks away from an unloaded chunk. This caused a game crash with biomesoplenty.
After rejoining from the game crash, I was at the spot before I TPed

When did the crash happen?

When TPing using JourneyMap's Right Click > Teleport feature to teleport in game.

From testing, the crash does not appear to be consistent, with only 2 of 25 attempts (excluding the first) actually resulting in a game crash. This makes it very difficult to find why exactly this causes a crash.

Steps to reproduce

1. Get into a world and run ~500 blocks in some direction
2. TP somewhere on the edge of where JourneyMap displays explored areas
3. Game crashes occasionally. If a game crash doesn't occur, then TPing elsewhere might.

Minecraft crash report

Original game crash:
crash-2025-01-01_19.00.16-server.txt

I don't have access to crash logs from my tests

Additional context

I think this also resulted in a dupe of items in my Backpack. I took some items from my Backpack (that was on my back) into my inventory and, after rejoining from the game crash, the items were in both my Backpack and inventory.

[Atricos]

Can you give me the seed and one exact coordinate where this happens to see if I can reproduce it?