With respect OP, your school cannot be operating as a 'normal' primary and I very much doubt that all teachers are in and delivering normal lessons.
Teachers and all staff are working on rota's to provide childcare for keyworker and vulnerable children. Classes aren't running as normal because all teachers are delivering work/lessons to pupils who are at home, as well as pupils in the day-care setting.
They are working on rota because a high percentage of staff are parents themselves with their own DC who are learning from home. School staff can't bring their own DC into work with them so many are working from home, delivering lessons to pupils online.
TA teams are rota'd to provide childcare - so they monitor children as they work on the same tasks as the children at home.
None of this school experience is 'normal' for anyone.
If you've heard of classes that are being taught as 'normal' then I question whether some patents are taking the absolute piss and sending their DC to relieve them of their own parenting duties. These 'normal' classes are probably filled with a mix of ages and an over-anxious teacher/TA who are doing their best to manage a large number of children with varying learning needs in too large a bubble.
School areas - certainly in secondary schools are closed off, so childcare is in a very small secured section. The rest of the schools are areas where teachers can deliver online lessons in a live stream. For safeguarding reasons, teachers (certainly in Wales) shouldn't be delivering 'live' lessons from their own homes, using their own equipment - it's not allowed.
I often wonder whether some patents forget that their children's teachers are also parents themselves who are trying to balance work responsibilities and caring for their own DC who are at home. Anyway, these last 2 points aren't strictly relevant to your OP, but the overwhelming feeling I have is to say that you just have to give your head a bit of a wobble here OP, and power through it.
There is no ideal scenario here. Many people are behaving 'unfairly' here and are pushing the 'system' to its knees (Health and Education). Some folk are really doing the very best they can - just be one of them.