iPad: How to write on sticky notes with Pencil in Freeform

Im currently trying out freeform and was surprised to find out that I can not write anything with my Pencil on sticky notes. I can add text to sticky notes the usual ways, but anything writen with Apple Pencil is not attached to the sticky note. I.e. if I move the sticky note my writen text doenst move along with it. Am I missing something?