However, the 2M probes ended significantly heavier than intended and engineers also ran out of time to conduct drop tests of the lander, so that part was abandoned which left only the orbiter.
The 2M probes ended up being significantly more substantial than anticipated, and due to this, engineers failed to conduct the required drop tests for the lander within the allotted timeframe, resulting in the cancellation of that part, which left only the orbiter intact.