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People often see yellowing leaves on their beans for a variety of reasons, but the only references to pale green leaves I see are that some cultivars seem to have paler leaves, or leaves pale when they're younger. Here's some excellent material on growing beans in containers, perhaps you'll find some of it useful: https://www.gardeningknowhow.com/edible/vegetables/beans/growing-beans-in-containers.htm

The number of plants you can sow in a pot depends on the diameter of the pot. Nine plants will fit comfortably in every 12 inches of surface space. Space seeds 3 inches apart or, for vining varieties, plant 2 to 3 seeds around each pole. Be sure to pick a pot deep enough for your bean variety - pole beans need 8 to 9 inches of soil, bush beans need 6 to 7 inches. When you are ready to sow seeds, you can start the seeds indoors or you can do so outside, provided it's warm enough.

For more detailed information on growing beans in containers, please visit the following link:

https://www.gardeningknowhow.com/edible/vegetables/beans/growing-beans-in-containers.htm

This article should help: https://www.gardeningknowhow.com/edible/vegetables/beans/yellow-leaves-on-beans.htm

I think that in your case, it would be best to get a sample of the soil tested. There are many, many reasons that they did not come up, from pests and rodents to soil imbalance to nutrient issues. If you start by having your soil tested, you can make sure that you have eliminated that as an issue. Your local extension service should be able to help you with checking your soil. You may find this article helpful:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm

There is not really a fungus, bacteria or virus that attacks all the different types of vegetables in the garden in this way, so I think that you can rule that out.

My gut would say that either the plants are underwatered or overwatered. While you do water 2X a week, if the water is not enough (2-4" per week) or if the water is not penetrating the soil, the plants would yellow and die in this fashion. On the flip side, if you were giving the plants too much water and it was not draining properly (i.e. they were in standing water a significant amount of time), the roots would start to rot, which would also cause the plants to yellow and die.

The other possibility is that something is being sprayed on the plants, likely accidentally. A weedkiller that has been mislabled or if weed killer was sprayed nearby on a windy day and the overspray got on the plants, they would also yellow and die.

There could be a few reasons and this article will help you pinpoint the issue.

https://www.gardeningknowhow.com/edible/vegetables/beans/bean-blossoms-no-pods.htm