Category: on child as parent assignment, sub-tree is unavailable
Table: sys_category ===================================
If an existing category is edited and a child node is assigned as parent, after saving, the category and sub-tree, under edited category, are no more available (loop).
How to reproduce.
Current category tree is
Category | |__cat00 | |__cat01 | | | |__cat03 | | | |__cat04 | | | |__cat05 | |__cat02
(re)edit cat01 category and change its parent to cat03, then save.
cat01 and sub-tree disappear: resettable only via database editing.