diff --git a/xarray/core/alignment.py b/xarray/core/alignment.py
index 8c95acadb2e..f2f599f8f59 100644
--- a/xarray/core/alignment.py
+++ b/xarray/core/alignment.py
@@ -846,12 +846,6 @@ def is_alignable(obj):
         else:
             out[position][key] = aligned_obj  # type: ignore[index]  # maybe someone can fix this?
 
-    # something went wrong: we should have replaced all sentinel values
-    for arg in out:
-        assert arg is not not_replaced
-        if is_dict_like(arg):
-            assert all(value is not not_replaced for value in arg.values())
-
     return out