Consistency of teaching - one teacher per class rather than multiples

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Is there evidence (preferably scientific) to support that primary school children's cognitive learning and behaviour improves with one consistent class teacher rather that multiple teachers per week (ie 3 different ones on different days)?

Our small village primary school has unfortunately been hit with a spate of sickness and maternity leave, which we understand is unavoidable. However, their solution for year 6 next term is to put in three different teachers per week for at least the next six months while their current teacher is off sick. She may not return for even longer.

Are we rightly concerned that having three different teachers per week, will negatively impact their learning experience?

they will generally only have one teacher for any subject.

ideally yes, but in practice, unlikely. Especially in year 7, when there simply are not enough teachers to go around, and schools have to concentrate their resources in year 10 and 11

mrz, I am sure that's normal in lots of countries.
In my country, children start school at 6. So grade 1= 6/7 years old.
In US grades, Grade1 is equivalent to yr2. So some country start school as same age as a child who is in their third year(yr2) of school in England.

Lack of consistency is more likely an issue with more than one teacher and especially hard fir the leadership of the school to even meet together with all staff to talk ethos, standards, children and school messages. The Impact can be minimised but has to be really well managed by leaders with full time staff playing their part too.

Though we are all in a position of 'take what you can get'. There is a shortage of teachers, especially good ones. I think teaching has become much harder and the time expectations are so huge, with a family it is just about impossible to teach full time. Recently I haven't been able to secure full time supply staff even, being told by the agencies "we have very few who will teach full time". The profession and education system really is breaking.