Oh, actually set n_tasks as well :P

ggml/src/ggml-cpu/ggml-cpu.c

@@ -2305,13 +2305,13 @@ static int ggml_get_n_tasks(struct ggml_tensor * node, int n_threads) {
         case GGML_OP_RWKV_WKV6:
         case GGML_OP_GATED_LINEAR_ATTN:
         case GGML_OP_RWKV_WKV7:
+        case GGML_OP_DELTA_NET:
             {
                 n_tasks = n_threads;
             } break;
         case GGML_OP_WIN_PART:
         case GGML_OP_WIN_UNPART:
         case GGML_OP_GET_REL_POS:
-        case GGML_OP_DELTA_NET:
             {
                 n_tasks = 1;
             } break;