reverse auto flatten

Following crossing two lines using Auto Flatten is there any command (not ctrl z) that allows to reverse Auto Flatten so that one can use the crossed lines as two separate lines again?

You can Undo a Flatten command if it was recent enough and you have not manually saved the project but I doubt that there is a way to unflatten lines created with Auto-flatten enabled.

This is Animate but the shared features with Harmony between the two usually work identically. Harmony 11 seems to be moving away from this, slightly at least, but looking through the documentation there is nothing indicating anything has changed in this particular feature.

A post by Lilly of Toon Boom:

Harmony 11:

TB can not do that, trust me.
p.s.I like simple and direct answer.

Thanks! Even though it seems you are right ;-))