With this small sampling the whole thing is anecdotal and basically meaningless at this point.
However, if this trend continues over a longer period of time it becomes meaningful and alarming.
When 60% have tcell immunity, its all anecdotal anyway. You could give skittles and have a 60% or better success rate .
So when 60% have tcell immunity and you have this many breakthrough cases, its an abysmal failure. I thing the latest Israeli study says vax 39% effective