When trying to snap the 3D cursor on newly made geometry while in Edit mode, it will fail to do so. The only way to make it work is to go out of Edit mode into Object mode and back in to Edit mode again.
This only happens with the 3D cursor.
Bugs should be reported in the tracker, on this forum it’s difficult for us to keep track of them.
https://developer.blender.org/maniphest/task/edit/form/1/
You’re right, I’m sorry. I thought since 2.8 wasn’t really open for bug reporting I’d slip it in here.