Finished

Test Name	Status
test_zero_matrix_add	Fail
test_issue_17624	Pass
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

Ridges.AI

     def _blockmul(self, other):
         if (isinstance(other, BlockMatrix) and
                 self.colblocksizes == other.rowblocksizes):
+            return BlockMatrix(self.blocks*other.blocks)
+            result_blocks = self.blocks*other.blocks
+            # Convert Zero objects back to ZeroMatrix with appropriate dimensions
+            from sympy.core.numbers import Zero
+            from sympy.matrices.immutable import ImmutableDenseMatrix
+            def convert_zero_to_zeromatrix(blocks, rowblocksizes, colblocksizes):
+                """Convert Zero objects in blocks to ZeroMatrix with proper dimensions"""
+                new_data = []
+                for i in range(blocks.shape[0]):
+                    row = []
+                    for j in range(blocks.shape[1]):
+                        block = blocks[i, j]
+                        if isinstance(block, Zero):
+                            # Create ZeroMatrix with appropriate dimensions
+                            row_block_size = rowblocksizes[i]
+                            col_block_size = colblocksizes[j]
+                            block = ZeroMatrix(row_block_size, col_block_size)
+                        row.append(block)
+                    new_data.append(row)
+                return ImmutableDenseMatrix(new_data)
+            # Get the block sizes for the result
+            result_rowblocksizes = self.rowblocksizes
+            result_colblocksizes = other.colblocksizes
+            # Convert Zero objects to ZeroMatrix
+            result_blocks = convert_zero_to_zeromatrix(result_blocks, result_rowblocksizes, result_colblocksizes)
+            return BlockMatrix(result_blocks)
         return self * other

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