Chunk.java

        // Paper start
        Chunk currentChunk = entity.currentChunk != null ? entity.currentChunk.get() : null;
        if (currentChunk == this) entity.setCurrentChunk(null);
        if (this.entitySlices[i].remove(entity)) {
            if (entitySlices[i] == entity.entitySlice) {
                entity.entitySlice = null;
            } else if (entity.entitySlice != null && entity.entitySlice.contains(entity)) {
                String thisChunkStr = world.getWorld().getName() + ":" + this.loc;
                ChunkEntitySlice entitySlice = entity.entitySlice;
                Chunk otherChunk = entitySlice.chunk;
                String otherChunkStr = otherChunk.world.getWorld().getName() + ":" + otherChunk.loc + " slice " + entitySlice.slice;
                LOGGER.error("Removed " + entity + " correctly from chunk " + thisChunkStr +
                    " from slice: " + i + " but entitySlice was also in  " + otherChunkStr, new Throwable("Failed remove called at"));
                otherChunk.removeEntity(entity, entitySlice.slice);
            }
            entity.inChunk = false;
        } else if (entity.entitySlice == null) {
            return;
        } else {
            if (entitySlices[i] == entity.entitySlice) {
                // we should have been here but wasn't
                entity.entitySlice = null;
            }
            String curChunkStr = currentChunk != null ? currentChunk.world.getWorld().getName() + ":" + currentChunk.loc : "no chunk";
            String thisChunkStr = world.getWorld().getName() + ":" + this.loc;
            LOGGER.error("Tried to remove " + entity + " from wrong slice: " + i + " in chunk " + thisChunkStr +
                ", was in slice " + entity.chunkY + " of chunk " + curChunkStr, new Throwable("Failed remove called at"));
            if (WorldServer.DEBUG_ENTITIES) {
                if (entity.lastChunkRemove != null) {
                    entity.lastChunkRemove.printStackTrace();
                }
                if (entity.lastChunkAdd != null) {
                    entity.lastChunkAdd.printStackTrace();
                }
            }
            return;