Ltcg related: selling an old property to invest in a new one.

My father has received a decent offer to sell his 15 year old property in native. At the same time we want to reinvest the proceeds into a newly launched property in Bangalore. But the catch here is that new property has a completion timeline of end of 2030 which makes it a 4 year project. And this falls outside the acceptable completion time of Section 54 of Income tax act. While we are completely investing the proceeds into this, why should consumer not get the benefit because of builder taking longer than 3 years to complete. Is there a way out, please.