Fix priority scheduling logic

This resolves sync loads not being properly prioritised.

patches/server/0989-Moonrise-optimisation-patches.patch

@@ -11627,7 +11627,7 @@ index 0000000000000000000000000000000000000000..c1c119e2e788d5963de3a74a6b9724c7
 +}
 diff --git a/src/main/java/ca/spottedleaf/moonrise/patches/chunk_system/scheduling/NewChunkHolder.java b/src/main/java/ca/spottedleaf/moonrise/patches/chunk_system/scheduling/NewChunkHolder.java
 new file mode 100644
-index 0000000000000000000000000000000000000000..d5fc5756ea960096ff23376a6b7ac68a2a462d22
+index 0000000000000000000000000000000000000000..a7ada64a78e36642a6d5ce4a767bff12e675bb16
 --- /dev/null
 +++ b/src/main/java/ca/spottedleaf/moonrise/patches/chunk_system/scheduling/NewChunkHolder.java
 @@ -0,0 +1,2034 @@
@@ -12165,7 +12165,7 @@ index 0000000000000000000000000000000000000000..d5fc5756ea960096ff23376a6b7ac68a
 +            return us == null ? dfl : us;
 +        }
 +        if (us == null) {
-+            return dfl;
++            return neighbour;
 +        }
 +
 +        return PrioritisedExecutor.Priority.max(us, neighbour);
@@ -12211,7 +12211,7 @@ index 0000000000000000000000000000000000000000..d5fc5756ea960096ff23376a6b7ac68a
 +
 +    // must hold scheduling lock
 +    public void raisePriority(final PrioritisedExecutor.Priority priority) {
-+        if (this.priority == null || this.priority.isHigherOrEqualPriority(priority)) {
++        if (this.priority != null && this.priority.isHigherOrEqualPriority(priority)) {
 +            return;
 +        }
 +        this.setPriority(priority);
@@ -12242,7 +12242,7 @@ index 0000000000000000000000000000000000000000..d5fc5756ea960096ff23376a6b7ac68a
 +
 +    // must hold scheduling lock
 +    public void lowerPriority(final PrioritisedExecutor.Priority priority) {
-+        if (this.priority == null || this.priority.isLowerOrEqualPriority(priority)) {
++        if (this.priority != null && this.priority.isLowerOrEqualPriority(priority)) {
 +            return;
 +        }
 +        this.setPriority(priority);
@@ -25570,7 +25570,7 @@ index 0000000000000000000000000000000000000000..85950a1aa732ab8c01ad28bec9e0de14
 +    }
 +}
 diff --git a/src/main/java/io/papermc/paper/configuration/GlobalConfiguration.java b/src/main/java/io/papermc/paper/configuration/GlobalConfiguration.java
-index 2a5453707bc172d8d0efe3f11959cb0b5f830984..b8499c1cea97a1a88a53053bc7da132f2fd3928d 100644
+index 5160dc617cc5037cd3f10479454159f2a9984169..379452394679c466a09441d4c12882d0d00d9ef3 100644
 --- a/src/main/java/io/papermc/paper/configuration/GlobalConfiguration.java
 +++ b/src/main/java/io/papermc/paper/configuration/GlobalConfiguration.java
 @@ -29,6 +29,45 @@ public class GlobalConfiguration extends ConfigurationPart {