Workaround as field duplication is broken

src/lbmpy/creationfunctions.py

@@ -626,8 +626,17 @@ def create_lb_update_rule(collision_rule=None, lbm_config=None, lbm_optimisation
 
     if lbm_optimisation.symbolic_temporary_field is not None:
         dst_field = lbm_optimisation.symbolic_temporary_field
+    # else:
+        #   FIXME: Field duplication is currently broken in pystencils.
+        # dst_field = src_field.new_field_with_different_name(lbm_config.temporary_field_name)
+    elif src_field.has_fixed_shape:
+        field_size = src_field.shape
+        dst_field = Field.create_fixed_size(lbm_config.temporary_field_name, field_size, index_dimensions=1,
+                                            layout=lbm_optimisation.field_layout, dtype=fallback_field_data_type)
     else:
-        dst_field = src_field.new_field_with_different_name(lbm_config.temporary_field_name)
+        dst_field = Field.create_generic(lbm_config.temporary_field_name, spatial_dimensions=collision_rule.method.dim,
+                                         index_shape=(q,), layout=lbm_optimisation.field_layout,
+                                         dtype=fallback_field_data_type)
 
     kernel_type = lbm_config.kernel_type
     if kernel_type == 'stream_pull_only':