From deb2229f8b98ac84f6d29e7302d453df3dddd3b9 Mon Sep 17 00:00:00 2001
From: Jane Tournois <jane.tournois@geometryfactory.com>
Date: Wed, 30 Jul 2025 11:33:16 +0200
Subject: [PATCH] fix the case where `p` is hidden in the RT3

if `p` would be hidden, its conflict zone is empty
---
 Triangulation_3/include/CGAL/Regular_triangulation_3.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Triangulation_3/include/CGAL/Regular_triangulation_3.h b/Triangulation_3/include/CGAL/Regular_triangulation_3.h
index 4eb35b352bd..752e4333979 100644
--- a/Triangulation_3/include/CGAL/Regular_triangulation_3.h
+++ b/Triangulation_3/include/CGAL/Regular_triangulation_3.h
@@ -667,6 +667,9 @@ public:
   {
     CGAL_precondition(dimension() >= 2);
 
+    if(the_facet_is_in_its_cz)
+      *the_facet_is_in_its_cz = false;
+
     std::vector<Cell_handle> cells;
     cells.reserve(32);
     std::vector<Facet> facets;