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It sounds like your plants got pea wilt. This article will have more information:
https://www.gardeningknowhow.com/edible/vegetables/peas/peas-wilting.htm

I believe that they need more water. Plants in container need significantly more water than plants in the ground. Check the soil daily, and water it when dry to the touch on top.

If the fleece is very opaque, it should be fine to leave it. But if sun has trouble getting through it, it is best to remove it.

In general, you should be making sure that your vegetables get at least 2" of water a week. You should give those 2" of water to your plants once a week in one long watering per week to help the roots grow deep. If you receive a fair amount of rain, then do not water that week.

Allow them to grow on the vine for about four weeks longer than you would if you were going to eat them. When the pods are brown, they can be easily split open and you can remove the seeds from the pods. Place the peas in a dry, cool place until you’re ready to plant them. While some people put them in airttight, plastic containers, you'll want to make sure they are completely dry first as these hold in moisture. I typically use brown paper bags for storing seeds.

It is likely the frass from a pest of some kind. Since it's difficult to know what kind it is, we have found neem oil to be very effective against almost all harmful pests in the garden. If the black stuff is soot-like, it would be sooty mold, a fungus formed from pests like aphids. Neem oil would help with that as well. This article has more information:
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm