Partially revert last commit.

comfy_extras/nodes_lt.py

@@ -194,6 +194,11 @@ class LTXVAddGuide:
         frame_idx, latent_idx = self.get_latent_index(positive, latent_length, frame_idx, scale_factors)
         assert latent_idx + t.shape[2] <= latent_length, "Conditioning frames exceed the length of the latent sequence."
 
+        if frame_idx == 0:
+            latent_image, noise_mask = self.replace_latent_frames(latent_image, noise_mask, t, latent_idx, strength)
+            return (positive, negative, {"samples": latent_image, "noise_mask": noise_mask},)
+
+
         num_prefix_frames = min(self._num_prefix_frames, t.shape[2])
 
         positive, negative, latent_image, noise_mask = self.append_keyframe(