On page Droste, we see little grey dots in the pairs and threads diagram while selecting stiches, to indicate that the wand must be applied.
On page Stitches, the thread diagram is emptied while selecting stitches. The pairs-diagram is updated immediately.
Would be nice if both pages use the same system.
My preference:
Update pairs-diagram immediately (as on Stitches)
Don't empty threads diagram but show dots "update required" (as on Droste)