Today I started to shell my 'Grandma Gina's' pole bean. I LOVE this variety. I had several pods that had dried inside the house, though there were many (most) still left out on the tree/pole. I had started picking off pods that seemed close to drying to finish them off indoors. These were some seriously large pods. When I started cracking pods I was ASTONISHED to see that
nearly every one of them had sprouted. I've never seen
ANYTHING like this before. I had been so careful to watch them daily and check for any pod that was just barely mature enough to pull off.
So, I went outside to my tree with the rest of the pods still hanging on. Most of these were still quite soft to the to touch, and some were still somewhat green even. I started opening immature pods on different parts of the tree. All sprouted.

YIKES! This was a precious one that I got in a trade (thanks
@Artorius!) and had only a few seeds to start with. I couldn't believe that so many were split, and yet were so far from being dry.

I really had no choice but to shell every pod, as immature as many of them were, to try to save any that might not have sprouted yet. If they were ready to sprout before the bean was even fully mature, than I guess that I could shell them immature and hope for the best.
This is the box of bean seeds I had when I was done (3 plants) -
My guess was that more than
half were sprouted.
I sorted them out into #1 not split, #2 hopelessly immature but not split and #3 totally split.
#1
#2
#3
This photo was taken at the end of the day, after they had dried out a bit, so the skins started wrinkling on them. (While shelling the skins were mostly coming off.) The good news is that it looks like some seeds will be viable, but of poor quality as I shelled them too early. They are probably nearly double the size they should be dried. I hope that the good ones manage to dry without problems. This is another variety that is not available in Canada, so if I lose it......

At least I got around to shelling the pods today, to be able see how bad the situation was so that I could rescue what was out there. Silver lining.
I'm not sure what to attribute this splitting to. On the one hand we have had our share of rains, and that probably factored in, but none of my other bean varieties did this. Of the many 'Piekny Jas' beans I've shelled (comparable in its' large size) maybe 5 or 6 of close to 100 had sprouted in the shell. And it was never a whole shell, just the odd seed in a pod.
Here is a picture of a pod being shelled, it's a bit immature, but it shows just how fleshy and moist these pods are. It was like a layer of thick, wet fibre slush against the bean. I think this variety may have a built in weakness because of this pod characteristic. I'm not sure, but I wonder. It is a romano type - which are delicious - and the texture of romanos is much less fibrous than the pencil or filet types. I find them to have a mushroom texture more than a 'bean' texture. Perhaps the downside of that less fibrous quality is this layer of soft, moist 'bean slush' in the pod. The quaity that makes them delicious to me, also makes them difficult to save seed from? Does anyone have experience with this variety? Is this just a freak incident due to rain?