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Q.My Winter Squash Plants Are Not Growing, But Are Slowly Turning Yellow And Dying. What Might Be The Cause?

I have winter squash plants that are not growing. I have some that I have transplanted, and over the course of about a month and a half they just slowly go from a nice green to yellow, and eventually they have no root mass left, as seen in the photos. I've also started a plant in the bed (not transplanted) and it germinated, produced one true leaf, but that leave has not unfurled nor has the plant grown or produced other leaves in about a month. It looks like this plant is also starting to turn yellow. I have cucumbers and zucchini growing just fine in a bed over. In the same bed as the winter squash I have some green beans that appear to be doing fine. I have been fertilizing the squash, being careful to not over-fertilize. I have also tried adding boron as I read that insufficient boron can have negative impacts on squash root growth. I have seen no changes since adding boron or fertilizing. Do you have any ideas what might be causing this?