Hm. At the moment I am thinking about how I would react. I am currently considering mentally what disadvantages I have as a result. Furthermore, I ask myself questions such as:
Is it definitely a defect?
What restriction do I have due to the construction delay of the outdoor area?
Will this cause me additional costs?
etc.
I think I can answer all the questions with no and would, as already suggested, try to have the work done quite quickly now.
Annoying maybe, but otherwise everything is good. And if the neighbor is already finished, good for him.