fix 2 more migration issues

patches/server/Asynchronous-chunk-IO-and-loading.patch

@@ -1851,12 +1851,13 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +    }
 +
 +    public static void processConfiguration(GlobalConfiguration.AsyncChunks config) {
++        int threads = config.threads; // don't write back to config
 +        int cpus = Runtime.getRuntime().availableProcessors() / 2;
-+        if (config.threads <= 0) {
++        if (threads <= 0) {
 +            if (cpus <= 4) {
-+                config.threads = cpus <= 2 ? 1 : 2;
++                threads = cpus <= 2 ? 1 : 2;
 +            } else {
-+                config.threads = (int) Math.min(Integer.getInteger("paper.maxChunkThreads", 4), cpus / 2);
++                threads = (int) Math.min(Integer.getInteger("paper.maxChunkThreads", 4), cpus / 2);
 +            }
 +        }
 +        if (cpus == 1 && !Boolean.getBoolean("Paper.allowAsyncChunksSingleCore")) {
@@ -1869,12 +1870,12 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +        String sharedHostThreads = System.getenv("PAPER_ASYNC_CHUNKS_SHARED_HOST_THREADS");
 +        if (sharedHostThreads != null) {
 +            try {
-+                config.threads = Math.max(1, Math.min(config.threads, Integer.parseInt(sharedHostThreads)));
++                threads = Math.max(1, Math.min(threads, Integer.parseInt(sharedHostThreads)));
 +            } catch (NumberFormatException ignored) {}
 +        }
 +
 +        if (config.asyncChunks) {
-+            ChunkTaskManager.initGlobalLoadThreads(config.threads);
++            ChunkTaskManager.initGlobalLoadThreads(threads);
 +        }
 +    }
 +

patches/server/Paper-config-files.patch

@@ -3204,7 +3204,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +                value.node("loot-tables").set(prevValue);
 +                return path.with(path.size() - 1, "treasure-maps-find-already-discovered").array();
 +            })
-+            .addAction(path("alt-item-despawn-rate"), (path, value) -> {
++            .addAction(path("alt-item-despawn-rate", "items"), (path, value) -> {
 +                if (value.isMap()) {
 +                    Map<String, Integer> rebuild = new HashMap<>();
 +                    value.childrenMap().forEach((key, node) -> {