These hunks are for getEntities, which Mojang rewrote in 1.17.

diff --git a/src/main/java/net/minecraft/world/level/Level.java b/src/main/java/net/minecraft/world/level/Level.java
index 3a1b9f1ba19b28cebdafeb3b2476217d47213862..3e2cd6c7a34c1a792d7346019a8b039d1f4a7c04 100644
--- a/src/main/java/net/minecraft/world/level/Level.java
+++ b/src/main/java/net/minecraft/world/level/Level.java
@@ -1130,7 +1130,7 @@ public abstract class Level implements LevelAccessor, AutoCloseable {

         for (int i1 = i; i1 <= j; ++i1) {
             for (int j1 = k; j1 <= l; ++j1) {
-                LevelChunk chunk = ichunkprovider.getChunk(i1, j1, false);
+                LevelChunk chunk = (LevelChunk)this.getChunkIfLoadedImmediately(i1, j1); // Paper

                 if (chunk != null) {
                     chunk.getEntities(except, box, list, predicate);
@@ -1151,7 +1151,7 @@ public abstract class Level implements LevelAccessor, AutoCloseable {

         for (int i1 = i; i1 < j; ++i1) {
             for (int j1 = k; j1 < l; ++j1) {
-                LevelChunk chunk = this.getChunkSource().getChunk(i1, j1, false);
+                LevelChunk chunk = (LevelChunk)this.getChunkIfLoadedImmediately(i1, j1); // Paper

                 if (chunk != null) {
                     chunk.getEntities(type, box, list, predicate);
@@ -1174,7 +1174,7 @@ public abstract class Level implements LevelAccessor, AutoCloseable {

         for (int i1 = i; i1 < j; ++i1) {
             for (int j1 = k; j1 < l; ++j1) {
-                LevelChunk chunk = ichunkprovider.getChunk(i1, j1, false);
+                LevelChunk chunk = (LevelChunk)this.getChunkIfLoadedImmediately(i1, j1); // Paper

                 if (chunk != null) {
                     chunk.getEntitiesOfClass(entityClass, box, list, predicate);