"Tom Riddle didn't emerge from his dark place. And so Tom Riddle became Lord Voldemort. Maybe the black cloud Bane saw was Albus's loneliness."
-- Draco Malfoy (CC2.15)
Draco admits he has trouble talking to Scorpius since his wife Astoria died. He had always envied the friendship between Harry, Ron and Hermione at school. Without friends, Albus could end up in a dark place (CC2.15).
A short time later during the same day, following Draco and Harry's fight in the kitchen, September 2020
This event takes place during the Roseless timeline, as described in the essay "Albus Potter and the lesson in Quantum Mechanics" by Nick Moline.
Draco only had Crabbe and Goyle during his time at school - and they were not really adequate for a truely equal friendship. Ginny Weasley also admits that she envied the trio's friendship as well. This surprises Harry (CC2.15).
This is the first time that Harry and Draco have a civilised conversation with each other - and it turns out that they are able to talk about parenting and growing up. It feels like they have finally realised what they have in common after so many years of being enemies (CC2.15).
From the Web
Pottermore: Harry Potter and the Cursed Child
The theatre production opened in the West End of London at the Palace Theatre on 31 July 2016, with Jamie Parker in the role of Harry Potter, Poppy Miller as Ginny Weasley and Alex Price as Draco Malfoy: Harry Potter and the Cursed Child, Parts One and Two