Thanks for the details on the die back. I normally see the die back as you have described once the plant has done its job of producing fruit. The fruit seems to ripen beyond the beginning of the die back of the foliage. So with a very good beginning to the season would see the early loss of the foliage in general - job accomplished.
I will say that the one heritage tomato plant in the same garden has no yellowing at all and is still in full production looking healthy as a horse as opposed to the two other contemporary varieties.
Ha! Proof that the ripening cherry tomatoes aren't evaporating into thin air either.
My porch patio ... summer morning coffee and evening relaxing place. Starting most from corms or seeds has taken an inordinate amount of time and effort, but I am glad I did it this once
Amaranth from seed, a grain ordered from Colorado - two varieties. Red is 'love lies bleeding'. I was just curious and wanted to try it.
Pole beans are planted for shade in containers set on top of a kindling box in front of shop window.
On left is ... front, sweet pea; back, pole bean 'scarlet runner'
On right (red) is Amaranthus 'early splendour' to add a touch of colour
In middle is Sasha, the gentlest, softest little girl who hunts crickets and grasshoppers full time. She hops up on the kindling box to eat the blossoms falling from the pole bean. And, surprisingly

there are no beans on the lower part of the plants. Hmmmm. She did fall back down between the block wall and the kindling box, completely jammed in ... and needed help to get out. I have since blocked the ends where she jumps up.