I opened a new vanilla save with a YA female with Lady of the Knits, added 5 seats into the lot and the knitting basket in her inventory. Almost immediately before skill was learned, I had a -20 ding to her money, but she didn't move from her location. I opened her inventory and have the options to resume or frog the current project of a Pink Bear Beanie. If I tell her to resume it, she'll sit down and knit.
I then added a child, teen, adult, and elder to the household, all creative and with Lady/Lord of the Knits (except the child, who's just creative). They all got a basket. Again almost immediately before the skill was given, I had another -20 ding to the money. The Adult had "started" a knitting project for a Blue & White Bear Beanie, however he never moved from his location to begin the animation.
A few hours passed in game and the original YA sim "started" another $20 project, not starting the animation. Couple more hours passed and the Elder "started" a project, again with no movement.