On paper, my DS (Y3 at the start) should have suffered academically. Dyslexia had recently been suspected.
In reality he thrived. He worked 1-1 daily online with his TA, who had recently undertaken a diploma in dyslexia. He discovered a love of books, initially on Audible and then reading books that interested him. Working on a computer helped him more than writing stuff down. He got to indulge his artistic side in ways that were not constrained to the syllabus.
(Incidentally, he is now in secondary school and his teachers were surprised at the suggestion of dyslexia and say they have no reason to think he may be dyslexic.)
DD, Y7 at the start, had been at her new secondary school just long enough to forge some solid new friendships when lockdown happened, so maintained those via WhatsApp. She has just started 6th form college and doesn't seem to have suffered any negative impacts as a result of lockdown especially.
I guess it is down to the individual child, just as it is with adults - I have friends at work that really struggled with lockdown (some of them are still noticeably affected now, their mental health took a real battering), whereas my line manager commented at my appraisal back then that I had thrived and launched myself at the challenge.