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

     @property
     def rowblocksizes(self):
+        return [self.blocks[i, 0].rows for i in range(self.blockshape[0])]
+        from sympy.core.numbers import Zero
+        result = []
+        for i in range(self.blockshape[0]):
+            block = self.blocks[i, 0]
+            if isinstance(block, Zero):
+                # For scalar Zero objects, infer dimensions from other blocks in the same row
+                # This occurs when ZeroMatrix objects are multiplied and become scalar zeros
+                inferred_rows = None
+                for j in range(self.blockshape[1]):
+                    other_block = self.blocks[i, j]
+                    if not isinstance(other_block, Zero):
+                        inferred_rows = other_block.rows
+                        break
+                if inferred_rows is not None:
+                    result.append(inferred_rows)
+                else:
+                    # If all blocks in this row are scalar zeros, we cannot infer dimensions
+                    raise AttributeError(
+                        f"Cannot determine row size of scalar Zero at blocks[{i}, 0]. "
+                        f"All blocks in row {i} are scalar zeros, so dimensions cannot be inferred.")
+            else:
+                result.append(block.rows)
+        return result
     @property
     def colblocksizes(self):
+        return [self.blocks[0, i].cols for i in range(self.blockshape[1])]
+        from sympy.core.numbers import Zero
+        result = []
+        for i in range(self.blockshape[1]):
+            block = self.blocks[0, i]
+            if isinstance(block, Zero):
+                # For scalar Zero objects, infer dimensions from other blocks in the same column
+                # This occurs when ZeroMatrix objects are multiplied and become scalar zeros
+                inferred_cols = None
+                for j in range(self.blockshape[0]):
+                    other_block = self.blocks[j, i]
+                    if not isinstance(other_block, Zero):
+                        inferred_cols = other_block.cols
+                        break
+                if inferred_cols is not None:
+                    result.append(inferred_cols)
+                else:
+                    # If all blocks in this column are scalar zeros, we cannot infer dimensions
+                    raise AttributeError(
+                        f"Cannot determine column size of scalar Zero at blocks[0, {i}]. "
+                        f"All blocks in column {i} are scalar zeros, so dimensions cannot be inferred.")
+            else:
+                result.append(block.cols)
+        return result
     def structurally_equal(self, other):
         return (isinstance(other, BlockMatrix)
     def _blockmul(self, other):
         if (isinstance(other, BlockMatrix) and
                 self.colblocksizes == other.rowblocksizes):
+            return BlockMatrix(self.blocks*other.blocks)
+            # Perform the block multiplication
+            result_blocks = self.blocks * other.blocks
+            # Convert any scalar Zero objects back to ZeroMatrix objects
+            # This handles the case where ZeroMatrix * ZeroMatrix -> scalar Zero
+            from sympy.core.numbers import Zero
+            from sympy.matrices.immutable import ImmutableDenseMatrix
+            # Create a new matrix with proper ZeroMatrix objects
+            new_rows = []
+            for i in range(result_blocks.rows):
+                new_row = []
+                for j in range(result_blocks.cols):
+                    block = result_blocks[i, j]
+                    if isinstance(block, Zero):
+                        # Determine dimensions from other blocks in the same row/column
+                        # For row dimension, look at blocks in the same row
+                        row_dim = None
+                        for k in range(result_blocks.cols):
+                            other_block = result_blocks[i, k]
+                            if not isinstance(other_block, Zero):
+                                row_dim = other_block.rows
+                                break
+                        # For column dimension, look at blocks in the same column
+                        col_dim = None
+                        for k in range(result_blocks.rows):
+                            other_block = result_blocks[k, j]
+                            if not isinstance(other_block, Zero):
+                                col_dim = other_block.cols
+                                break
+                        # If we can't infer dimensions, use a fallback
+                        if row_dim is None or col_dim is None:
+                            # Try to infer from the original block structure
+                            # This is a fallback - in most cases this shouldn't happen
+                            row_dim = self.rowblocksizes[i] if i < len(self.rowblocksizes) else 1
+                            col_dim = other.colblocksizes[j] if j < len(other.colblocksizes) else 1
+                        # Create a ZeroMatrix with the inferred dimensions
+                        from sympy.matrices.expressions.matexpr import ZeroMatrix
+                        new_block = ZeroMatrix(row_dim, col_dim)
+                        new_row.append(new_block)
+                    else:
+                        new_row.append(block)
+                new_rows.append(new_row)
+            # Create the new BlockMatrix with proper ZeroMatrix objects
+            converted_blocks = ImmutableDenseMatrix(new_rows)
+            return BlockMatrix(converted_blocks)
         return self * other

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