Macro `auto-infflow` breaks UI Proof Tree

[wadoon]

Description

Loading an information flow proof obligation, and applying the auto-infflow macro results into a destroyed Proof Tree in the JTree, and a stack trace. UI is not usable anymore.

Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException: abstract tree node without parent: Proof Tree
	at de.uka.ilkd.key.gui.prooftree.GUIAbstractTreeNode.getParent(GUIAbstractTreeNode.java:49)
	at de.uka.ilkd.key.gui.prooftree.GUIAbstractTreeNode.getPath(GUIAbstractTreeNode.java:82)
	at de.uka.ilkd.key.gui.prooftree.GUIProofTreeModel.updateTree(GUIProofTreeModel.java:413)
	at de.uka.ilkd.key.gui.prooftree.GUIProofTreeModel.updateTree(GUIProofTreeModel.java:421)
	at de.uka.ilkd.key.gui.prooftree.ProofTreeView$GUIProofTreeProofListener.autoModeStopped(ProofTreeView.java:957)
	at de.uka.ilkd.key.control.AbstractProofControl.fireAutoModeStopped(AbstractProofControl.java:563)
	at de.uka.ilkd.key.ui.MediatorProofControl.fireAutoModeStopped(MediatorProofControl.java:73)
	at de.uka.ilkd.key.gui.ProofMacroWorker.done(ProofMacroWorker.java:133)

Reproducible

Is the issue reproducible?
always

Steps to reproduce

1. Load infflow PO from the examples dialog.
2. Apply the "Full Information Flow Auto Pilot"
3. Wait...
4. Be happy about the broken proof tree:
   

What is your expected behavior and what was the actual behavior?

Closed proof with a valid proof tree

Additional information

Bug is on main. Introduction unknown.