When assuming a safe distance from parked vehicles, should you take into account the possibility of one of the vehicles' doors opening?

Yes, this is a key element of the principle of maintaining a safe distance when passing. You should always assume that the driver or a passenger of a parked vehicle may suddenly open a door without ensuring it is safe to do so. Maintaining an adequate lateral distance (at least 1 metre is recommended) helps to avoid a collision and is an obligation arising from art. 23 of the Road Traffic Act.