I tutor privately and I think this is going to be an issue for at least the next 2 cycles of summer exams - possibly even 3 or 4.
You've got schools who start their GCSE content in Year 9 (because there's just so much of it, especially in maths and the sciences) whose students haven't completed a full Year 9. Then you've got the Year 10s who've just finished, going into Year 11 (to presumably sit 'the real exams' again in June 2022) who haven't completed a full Year 10.
That's without the Year 11s and 12s who have just finished their years with incomplete learning and gaps here, there and everywhere depending on how often they were able to access learning this past year, and the Year 13s now going on to uni with no idea what their baseline is for starting their undergrad courses.
My guess is that grade boundaries next year will have to drop through the floor to try and make up the difference between this year's 'best ever' results from TAGs and the way the algorithm pegs results for each grade with the exam results in normal years. And my bet is it will be similar in 2023. 
The whole thing is going to take a while to untangle, and it's the poor students who will never really know where they stand, along with A Level teachers and unis who won't really know where the gaps are with their new students. And that's without employers, who are still trying to get to grips with the 9-1 system instead of A, B, C etc for GCSEs, not really knowing what to trust on a job application with regard to exam success.
This mess isn't over yet.