Shaikh Khālid Al-Ẓafīrī, may Allāh protect him, said:

Why is Al-ʿAfwu Specifically Asked for on Lailah Al-Qadr?

Ibn Rajab [may Allāh have mercy on him] said:

Asking [Allāh] for complete forgiveness on the Great Night of Decrees, after working hard at doing good deeds on it and on the [last] ten nights, has only been prescribed because those who know [about Allāh properly] work hard at doing [good] deeds, and after that, they [still] don’t see for themselves any good deeds, nor a [good level or] state, nor [good, rewardable] speech. So they go back to asking for complete forgiveness, like one does who sins and falls short of what’s upon him.

Laṭāʾif Al-Maʿārif, p. 242.

Source: @almadani_k. 27 Apr 21.