I’m reviving this old thread, as the problem appears to still exist. Consider the following:

> \starttext \showframe
> 
> \definenote[afootnote][rule={on,right},paragraph=no]
> 
> \startalignment[r2l]
> Testing.\afootnote{This is footnote one.}
> Testing testing.\afootnote{This is footnote two.}
> Testing testing testing.\afootnote{This is footnote three.}
> \stopalignment
> 
> \stoptext