Limitation of the maximum XY speed by the max_z_velocity parameter

If the max_z_velocity parameter is specified, the maximum movement speed is limited to this value even if max_velocity is greater. For example [max_z_velocity: 50], [max_velocity: 200] here the maximum movement speed is only 50 mm/sec.
This is believed to be a bug, not a feature. If this is a bug, can you please fix it?