There we go.
No, you're doing your job, and you're doing your best to shore up your kids education this year. The teachers can't do it as they normally would, and yes, it falls to us, as parents, and actually to our children as well, to do the best we can to minimise negative impact on their education.
And also to recognise that this is really hard on everyone, parents, children, and teachers, and we can all only do our best, and cut ourselves and each other some slack, and realise that no, this isn't business as usual, and yes, there will be a degree of impact.
Can I suggest, if you feel your school or teacher is not providing to the extent you want or need, you might want to look at tutors? We had a really crap primary school, who refused to extend our kids, we got maths tuition, in another country. If you can afford it, even for the duration, that might give a little bit of peace of mind?