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])]
+        def _get_block_rows(block, i):
+            if hasattr(block, 'rows'):
+                return block.rows
+            # Handle scalar zeros - they should have the same dimensions as
+            # the corresponding block in the first column
+            # We need to infer this from the block structure
+            from sympy import S
+            if block == S.Zero:
+                # For scalar zeros, we need to determine the expected dimensions
+                # This is a workaround for when ZeroMatrix gets simplified to Zero
+                # We'll use the fact that all blocks in a row should have the same height
+                for j in range(self.blockshape[1]):
+                    other_block = self.blocks[i, j]
+                    if hasattr(other_block, 'rows'):
+                        return other_block.rows
+                # If we can't determine, assume 1x1 (this shouldn't happen in valid block matrices)
+                return 1
+            raise AttributeError(f"Block {block} does not have rows attribute")
+        return [_get_block_rows(self.blocks[i, 0], i) for i in range(self.blockshape[0])]
     @property
     def colblocksizes(self):
+        return [self.blocks[0, i].cols for i in range(self.blockshape[1])]
+        def _get_block_cols(block, j):
+            if hasattr(block, 'cols'):
+                return block.cols
+            # Handle scalar zeros - they should have the same dimensions as
+            # the corresponding block in the first row
+            # We need to infer this from the block structure
+            from sympy import S
+            if block == S.Zero:
+                # For scalar zeros, we need to determine the expected dimensions
+                # This is a workaround for when ZeroMatrix gets simplified to Zero
+                # We'll use the fact that all blocks in a column should have the same width
+                for i in range(self.blockshape[0]):
+                    other_block = self.blocks[i, j]
+                    if hasattr(other_block, 'cols'):
+                        return other_block.cols
+                # If we can't determine, assume 1x1 (this shouldn't happen in valid block matrices)
+                return 1
+            raise AttributeError(f"Block {block} does not have cols attribute")
+        return [_get_block_cols(self.blocks[0, j], j) for j in range(self.blockshape[1])]
     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 block multiplication
+            result_blocks = self.blocks*other.blocks
+            # Convert scalar Zero objects back to ZeroMatrix with appropriate dimensions
+            from sympy import S
+            from sympy.matrices.immutable import ImmutableDenseMatrix
+            def _fix_zero_block(block, i, j):
+                if block == S.Zero:
+                    # Determine the dimensions for this zero block
+                    # Row dimension comes from self.rowblocksizes[i]
+                    # Column dimension comes from other.colblocksizes[j]
+                    rows = self.rowblocksizes[i]
+                    cols = other.colblocksizes[j]
+                    return ZeroMatrix(rows, cols)
+                return block
+            # Apply the fix to all blocks
+            fixed_data = [[_fix_zero_block(result_blocks[i, j], i, j)
+                          for j in range(result_blocks.shape[1])]
+                          for i in range(result_blocks.shape[0])]
+            fixed_blocks = ImmutableDenseMatrix(fixed_data)
+            return BlockMatrix(fixed_blocks)
         return self * other

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