It is seen in the way they approach contributions but also in regular language. I created X, insistence that their 'curation' was very influencial to the output, difficulty to mention LLM contribution, attitude of 'I care about building while others lose time in details', refusal to engage with potential flaws, and so on.
It is surprisingly different to what I'm used to from senior devs, which behave like they always suspect their own work is flawed and half assed. Like impostor syndrome was reversed.