Product listing spacing issue but only for 1 product (others are fine)

This is because the last product image is taller.

I do not remember what product media settings were available for Dawn 2.4.

However, you can manually force images to fit into square – when configuring “Product information” section in Customize, open “Custom CSS” at the bottom of the section settings and paste this code:

.product__media {
  padding-top: 100% !important;
}

.product__media img {
  object-fit: contain;
}

Before => After