Maybe it’s because Corgis have a particularly interesting facial expression, and their figures and behaviors are also cute and funny, so they are often used to imitate the expressions or behaviors of other dogs or animals to create interesting, Creative pictures or videos.
These "face-bumping" pictures or videos have been widely circulated on social media and have become a feature and representative of the Corgi dog . Of course, this is just personal speculation. There may be other reasons and explanations for why Corgis often "bump into their faces."