Entering ToU info: "make rate zone recurring" greyed out

As of 1st of October my utility switched to winter rates.
It turned out I hadn’t entered my summer rates, but I did enter the winter rates a couple of months ago.

So now I am adding the summer rates in retrospect but it won’t allow me to make them recurring for next year.

I am using the web interface

I can not enter the start date past october 2021.
So i entered a “historic rate” but it won’t allow me to repeat that for next year ?!
Is that a bug?