Affixes are not shown when they are not realized on form view
In case the user opens a form that contains a O2M which is not realized when the view is opened (eg: the O2M is contained in a notebook page that is not shown) then the affixes are not shown.
This behaviour disappear once the form is reloaded or if the user goes to another record.
My proposal is to remove the decorator realized
on the affix setter. As the changelog that introduced it states, it's made to prevent loading lazy data (x2M) and I think that the affixes are safe data to load.