Sean Goldsbrough, director of Northern Space and Security, said there was no known re-entry plan for the Long March 5 launch.
What could be considered unpredictable results for the previous two launches are what causes concern.
Satellite operators are becoming more focused on designing objects that will break apart when reentering the atmosphere. It is done by using materials with low melting point temperatures.
Historically the materials used for housing fuel, such as titanium, require very high temperatures to burn up, so this can be expensive. In the case of the Long March 5, it's an issue because it's over 25 tonnes.
Since the fall of the Skylab space station in Australia in 1979 the other space agencies have been designing their rockets to fall into pieces.
Last year, after a previous re-entry by the China Manned Space Agency, Bill Nelson said that China was failing to meet responsible standards.
He said that spacefaring nations need to make sure that the risks of re-entries of space objects are minimized.
The same Long March 5 configuration has launched twice before, once in May 2020 and again in May 2021.
The debris from the rocket's core stage was dumped in the Indian Ocean on two separate occasions. There was a prototype that crashed into the ocean.
Some of the incidents received criticism from a range of space agencies. The Chinese state-run newspaper Global Times accused western media of a campaign against the Long March 5.
The second module was sent to the space station. The Wentian lab module will be the first one to join the station. The main living quarters of the space station were built with the help of China.
The goal is for the project to be completed by the end of 2022.
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