Vannilla snap points cannot be saved

[ZashIn]

The mod description states that vanilla snap points can be saved, but this is currently not the case (v0.18.3):

• [Create new Blueprint]:
  • Hold Alt and click to include vanilla snap points in your blueprint (without it only snap point markers are converted to snap points)
• [Edit selection]:
  • Copy with vanilla snap points: Make a temporary blueprint of your current selection which also includes all vanilla snap points of the pieces selected.
  • Cut with vanilla snap points: Make a temporary blueprint of your current selection and delete all pieces in the current selection including all vanilla snap points of the pieces selected.

The Alt option is shown as key tip, but does nothing.
The Edit Selection toll (of the rune) has no options for "vanilla snap points".