fix: default custom steps to be async?: false

lib/ash/data_layer/mnesia.ex

@@ -261,16 +261,7 @@ defmodule Ash.DataLayer.Mnesia do
   end
 
   @impl true
-  def transaction(resource, func, _timeout) do
-    func = fn ->
-      try do
-        func.()
-      rescue
-        exception ->
-          rollback(resource, Ash.Error.to_ash_error(exception, __STACKTRACE__))
-      end
-    end
-
+  def transaction(_, func, _timeout) do
     case Mnesia.transaction(func) do
       {:atomic, result} -> {:ok, result}
       {:aborted, reason} -> {:error, reason}

lib/ash/flow/step/custom.ex

@@ -13,7 +13,7 @@ defmodule Ash.Flow.Step.Custom do
         type: :boolean,
         doc:
           "Whether or not this step can be run outside of the current process. Defaults to true.",
-        default: true
+        default: false
       ]
     ]
     |> Ash.OptionsHelpers.merge_schemas(@shared_opts, "Global Options")