Fix CachedToAABBs when offset becomes zero

If the offset were to be undone, then it would incorrectly mark the
cache as not having an offset when it actually did.

patches/server/0027-fixup-Highly-optimise-single-and-multi-AABB-VoxelSha.patch

@@ -2176,10 +2176,10 @@ index 0000000000000000000000000000000000000000..1cb96b09375770f92f3e494ce2f28d9f
 +}
 diff --git a/src/main/java/io/papermc/paper/util/collisions/CachedToAABBs.java b/src/main/java/io/papermc/paper/util/collisions/CachedToAABBs.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..7aa8a16b5a58b709f644ff3600a4dd9b5e0b501d
+index 0000000000000000000000000000000000000000..85c448a775f60ca4b4a4f2baf17487ef45bdd383
 --- /dev/null
 +++ b/src/main/java/io/papermc/paper/util/collisions/CachedToAABBs.java
-@@ -0,0 +1,37 @@
+@@ -0,0 +1,39 @@
 +package io.papermc.paper.util.collisions;
 +
 +import net.minecraft.world.phys.AABB;
@@ -2208,13 +2208,15 @@ index 0000000000000000000000000000000000000000..7aa8a16b5a58b709f644ff3600a4dd9b
 +    }
 +
 +    public static CachedToAABBs offset(final CachedToAABBs cache, final double offX, final double offY, final double offZ) {
++        if (offX == 0.0 && offY == 0.0 && offZ == 0.0) {
++            return cache;
++        }
++
 +        final double resX = cache.offX + offX;
 +        final double resY = cache.offY + offY;
 +        final double resZ = cache.offZ + offZ;
 +
-+        final boolean isOffset = resX != 0.0 || resY != 0.0 || resZ != 0.0;
-+
-+        return new CachedToAABBs(cache.aabbs, isOffset, resX, resY, resZ);
++        return new CachedToAABBs(cache.aabbs, true, resX, resY, resZ);
 +    }
 +}
 diff --git a/src/main/java/io/papermc/paper/util/collisions/FlatBitsetUtil.java b/src/main/java/io/papermc/paper/util/collisions/FlatBitsetUtil.java