Hypothesis tests with the same meaning or wrong in context?

Hello,

the task is as follows:

A nut mix should contain 30% walnuts and 70% hazelnuts.

A machine fills the nuts into bags of 50 nuts each.

You take out two bags and count 80 hazelnuts.

Using a significance test at a significance level of 5%, decide whether the hypothesis "30% walnuts can be maintained."

Now my problem is: I calculated with the null hypothesis p=0.3 and the solutions with p=0.7.

Both should be equivalent, right? After all, the error probabilities of both calculation methods are identical to several decimal places?

Or is my null hypothesis of p=0.3 wrongly chosen in the context?