[NPU] [Bugfix] [Diffusion] Fixed gray images at the generation output (#23266)

Co-authored-by: ronnie_zheng <zl19940307@163.com>

.github/workflows/pr-test-npu.yml

@@ -64,6 +64,7 @@ jobs:
               - ".github/workflows/pr-test-npu.yml"
             multimodal_gen:
               - "python/sglang/multimodal_gen/**/!(*.md|*.ipynb)"
+              - "python/sglang/jit_kernel/diffusion/triton/npu_fallback.py"
               - "python/sglang/srt/**"
               - "python/pyproject_npu.toml"
               - "scripts/ci/npu/npu_ci_install_dependency.sh"

python/sglang/jit_kernel/diffusion/triton/npu_fallback.py

@@ -28,6 +28,7 @@ def apply_rotary_embedding_native(
         and x.dim() == 3
         and x.shape[1] < NPU_ROTARY_MUL_MAX_NUM_HEADS
         and x.shape[2] < NPU_ROTARY_MUL_MAX_HEAD_SIZE
+        and not interleaved
     ):
         if cos.size(-1) * 2 == x.size(-1):
             cos = torch.cat([cos, cos], dim=-1)