Indeed, it is suboptimal, and this appears to be a widespread problem internationally with the D7UF1 utilised in larger vehicles; the performance of the smaller equivalent, D7GF1, remains uncertain. The dual-mass flywheel may potentially be a problem. I saw that certain manufacturers have forsaken dual-clutch systems, with the ZF 8-speed gearbox gaining prominence in numerous larger applications; nonetheless, there are even accounts of its disintegration.
The dealer raised no objections, and the technician indicated that the service will be performed in accordance with a Technical Service Bulletin from the manufacturer. I perceived that they were quite knowledgeable about the problem.
Upon collection, I was informed that the clutch had been replaced and the TCU control logic had been upgraded. Currently, there is a significant enhancement in its performance; it predominantly used first gear at low speeds and no longer attempts to accelerate in second gear from 2-3 mph as it previously did, indicating deliberate efforts to refine gear selection and minimise clutch wear. It is hoped that this will now demonstrate more durability.
In the OP's situation, I am doubtful that the dealer effectively rectified the issue on the initial attempt, given the rapid recurrence of the error over a short distance. However, as you mentioned, we must ascertain the specific work that was performed.