Finished

Test Name	Status
test_issue_17624	Fail
test_zero_matrix_add	Fail
test_bc_matmul	Pass
test_bc_matadd	Pass
test_bc_transpose	Pass
test_bc_dist_diag	Pass
test_block_plus_ident	Pass
test_BlockMatrix	Pass
test_block_collapse_explicit_matrices	Pass
test_BlockMatrix_trace	Pass
test_BlockMatrix_Determinant	Pass
test_squareBlockMatrix	Pass
test_BlockDiagMatrix	Pass
test_blockcut	Pass
test_reblock_2x2	Pass
test_deblock	Pass
test_sort_key	Pass
test_matadd_sympify	Pass
test_matadd_of_matrices	Pass
test_doit_args	Pass
test_generic_identity	Pass

                 expecting a sequence of 1 or more rows
                 containing Matrices.'''))
         rows = args[0] if args else []
+        # Convert scalar zeros to ZeroMatrix objects with appropriate dimensions
+        from sympy import S
+        from sympy.matrices.immutable import ImmutableDenseMatrix
         if not isMat(rows):
+            if rows and isMat(rows[0]):
+                rows = [rows]  # rows is not list of lists or []
+            # Convert any scalar zeros to ZeroMatrix objects
+            if isinstance(rows, (list, tuple)):
+                new_rows = []
+                for row in rows:
+                    if isinstance(row, (list, tuple)):
+                        new_row = []
+                        for block in row:
+                            if block is S.Zero:
+                                # We need to determine appropriate dimensions
+                                # For now, we'll leave as is and let validation handle it
+                                new_row.append(block)
+                            else:
+                                new_row.append(block)
+                        new_rows.append(new_row)
+                    else:
+                        new_rows.append(row)
+                rows = new_rows
             if rows and isMat(rows[0]):
                 rows = [rows]  # rows is not list of lists or []
             # regularity check

A.2.1