do not access TileEntities in unloaded chunks

src/main/kotlin/mods/betterfoliage/client/integration/ForestryIntegration.kt

@@ -11,6 +11,8 @@ import mods.betterfoliage.loader.Refs
 import mods.octarinecore.client.resource.ModelProcessor
 import mods.octarinecore.client.resource.ModelVariant
 import mods.octarinecore.client.resource.registerSprite
+import mods.octarinecore.getTileEntitySafe
+import mods.octarinecore.isBlockLoaded
 import mods.octarinecore.metaprog.ClassRef
 import mods.octarinecore.metaprog.FieldRef
 import mods.octarinecore.metaprog.MethodRef
@@ -117,7 +119,7 @@ object ForestryLeavesSupport : ILeafRegistry {
         }
 
         // extract leaf texture information from TileEntity
-        val tile = tryDefault(null) { world.getTileEntity(pos) } ?: return null
+        val tile = world.getTileEntitySafe(pos) ?: return null
         if (!ForestryIntegration.TileLeaves.isInstance(tile)) return null
         val textureLoc = ForestryIntegration.TiLgetLeaveSprite.invoke(tile, Minecraft.isFancyGraphicsEnabled()) ?: return null
         return textureToValue[textureLoc]

src/main/kotlin/mods/octarinecore/Utils.kt

@@ -2,7 +2,12 @@
 @file:Suppress("NOTHING_TO_INLINE")
 package mods.octarinecore
 
+import net.minecraft.tileentity.TileEntity
 import net.minecraft.util.ResourceLocation
+import net.minecraft.util.math.BlockPos
+import net.minecraft.world.ChunkCache
+import net.minecraft.world.IBlockAccess
+import net.minecraft.world.World
 import kotlin.reflect.KProperty
 import java.lang.Math.*
 
@@ -93,3 +98,21 @@ fun Int.minmax(minVal: Int, maxVal: Int) = min(max(this, minVal), maxVal)
 fun nextPowerOf2(x: Int): Int {
     return 1 shl (if (x == 0) 0 else 32 - Integer.numberOfLeadingZeros(x - 1))
 }
+
+/**
+ * Check if the Chunk containing the given [BlockPos] is loaded.
+ * Works for both [World] and [ChunkCache] instances.
+ */
+fun IBlockAccess.isBlockLoaded(pos: BlockPos) = when(this) {
+    is World -> isBlockLoaded(pos, false)
+    is ChunkCache -> world.isBlockLoaded(pos, false)
+    else -> false
+}
+
+/**
+ * Get the [TileEntity] at the given position, suppressing exceptions.
+ * Also returns null if the chunk is unloaded, which can happen because of multithreaded rendering.
+ */
+fun IBlockAccess.getTileEntitySafe(pos: BlockPos): TileEntity? = tryDefault(null) {
+    if (isBlockLoaded(pos)) getTileEntity(pos) else null
+}

src/main/resources/META-INF/BetterFoliage_at.cfg

@@ -11,3 +11,5 @@ public net.minecraft.client.renderer.BufferBuilder func_181670_b(I)V # growBuffe
 public net.minecraft.client.renderer.BufferBuilder func_181664_j()I # getBufferSize
 
 public net.minecraft.client.renderer.BlockModelRenderer field_187499_a # blockColors
+
+public net.minecraft.world.ChunkCache field_72815_e # world