I would suspect that the majority of schools have taken it as best they can into consideration.
Some teachers may have been too harsh, and assumed 2019 grade boundaries with a lower achieving (due to missed school) cohort. And if they wish the media will be able to run a lot of stories about the wonderful pupils that got better than their expectations and are very happy.
Some teachers may have used the 2022 papers and grade boundaries. This would be a little silly as it's been known long enough that isn't the case, but it's possible some have. The media can choose to run stories about the devastated pupils whose results were not what they hoped for and didn't get into the university of choice.
Those two different stories could be run any year anyway if the media chose to. Normally they choose the top run. In 2020 they chose the bottom one. They manipulate it by something as simple as that.
I suspect they're already planning on the second one.
The idea is the same proportions this year get each grade as in 2019. So in real terms, over the entire cohort, there should be approximately the same amount who are thrilled with results above what they wanted, and those who are disappointed. It does depend on what teachers have predicted though.
However:
Universities have the difficulty any year that they don't know how many of their offers will be make the grades.
When they get the grades from their potential students, they have those who made the offer, who must be accepted. Those who have not made the offer can still be accepted.
If the course is already full of those who made the offers, then they will refuse all the ones who failed to make the grades. They don't have a choice to say "actually A made his offer, but we preferred B".
After that they consider the offers individually over the week before, and decide which students who have not made the grade they want, and which they don't. It may be that they decide it's better to use clearing, or better to take those who missed grades.
Dd1 missed one grade for Durham. She could see that they accepted her the previous evening, so they'd obviously taken some time to consider it and then decided to accept her anyway.
I suspect this year is particularly difficult though. They don't want to end up with too many students as they did in 2020 for some places. So it might be that they have chosen to make fewer offers to make sure they don't end up with too many. They then, if they don't have the spaces full, can choose to accept students who have missed the grade.
I suspect that may well be the case. So we may see a bit of an upturn in students who missed the grade but still get accepted. We may see an increase in courses in clearing too.
One thing for students can be is that for dd1 in 2019, track (UCAS) was updated before she got her A-level results, I think by half an hour. So she knew that she had been accepted before she knew her results.