Bugfix.

js/resize_dither.js

@@ -146,6 +146,7 @@ app.registerExtension({
       controlLayout: null,
       vgaPalette: [...FALLBACK_PALETTE],
       binaryToPaletteLut: null,
+      bootstrapRevision: 0,
 
       findWidget: function (name) {
         return this.widgets?.find((w) => w.name === name);
@@ -719,6 +720,9 @@ api.addEventListener("game_dev.resize_dither.initialise", ({ detail }) => {
     return;
   }
 
+  node.bootstrapRevision = (node.bootstrapRevision || 0) + 1;
+  const revision = node.bootstrapRevision;
+
   if (Number.isFinite(detail.width)) {
     node.setWidgetValue("width", clamp(toInt(detail.width, 256), 1, MAX_DIMENSION));
   }
@@ -736,6 +740,10 @@ api.addEventListener("game_dev.resize_dither.initialise", ({ detail }) => {
   }
 
   const onBeforeLoad = () => {
+    if (revision !== node.bootstrapRevision) {
+      return;
+    }
+
     if (!node.hasUserResizedNode && node.originalImage) {
       const aspectRatio = node.originalImage.naturalWidth / node.originalImage.naturalHeight;
       node.size[0] = NODE_BASE_WIDTH;
@@ -759,14 +767,25 @@ api.addEventListener("game_dev.resize_dither.initialise", ({ detail }) => {
     const afterImg = new Image();
     afterImg.src = "data:image/png;base64," + detail.preview_after;
     afterImg.onload = () => {
-      node.imagePreview = afterImg;
-      node.setDirtyCanvas(true, true);
+      if (revision !== node.bootstrapRevision) {
+        return;
+      }
+
+      // Only use backend after-preview as a temporary fallback before source pixels are ready.
+      if (!node.sourcePixelData || !node.originalImage) {
+        node.imagePreview = afterImg;
+        node.setDirtyCanvas(true, true);
+      }
     };
   }
 
   const beforeImg = new Image();
   beforeImg.src = "data:image/png;base64," + detail.preview_before;
   beforeImg.onload = () => {
+    if (revision !== node.bootstrapRevision) {
+      return;
+    }
+
     node.originalImage = beforeImg;
     onBeforeLoad();
   };