Extension v0.25.1 - I used the "create source" workflow and added a kustomization to demo this to someone, when I got to the bottom of the form and clicked on "Create YAML" nothing happened for a bit. I clicked a few more times, waited a while, and then saw the expected results. (as many times as I had clicked the button...)
I'm not sure if this is reproducible yet, but I wanted to make a note about it before I forget.