It is preferable if genetically engineered crops cannot reproduce. The impact of their wild propagation should be studied first, not unleashed upon the local ecosystem.
In general, crop plants don't propagate well in the wild. The whole point of breeding a crop plant is to remove their chemical defenses (to make them edible) and to make them produce lots of edible parts. This is usually the direct opposite of what plants need to survive in the wild.
This is a real thing that happens. There have been major court cases about it, like this one from Canada https://en.wikipedia.org/wiki/Monsanto_Canada_Inc_v_Schmeise...
By "wild propagation" I meant outside of the original controlled planting.
Propagating to another farm leaves the controlled area and now it's spreading in the wild.
"The impact of their wild propagation should be studied first, not unleashed upon the local ecosystem."
So by "wild propagation" you meant farm-to-farm propagation? And by "local ecosystem" you meant "farmers' fields"? And you accuse others of redefining words.