Q.Japanese wisteria flowering
Japanese wisteria flowered but didn’t send out new shoots afterwards. It has flowered for the last 3 years but this year, for the first time, it has not sent out new shoots after flowering. Every other year the new growth has been very vigorous.
I can't really locate any issues that directly would correspond with last of twiners forming.
Review the care information in the articles below.
https://www.gardeningknowhow.com/ornamental/vines/wisteria/pruning-wisteria.htm
https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-no-leaves.htm
https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-blooming-problems.htm