Why tree is invalid? - symfony

Question

I have a entity that use doctrine extension, tree behaviuor, i found problems in tree and don't know it's reason.
my entity:
MyEntity:
type: entity
gedmo:
tree:
type: nested
id:
id:
type: integer
generator:
strategy: AUTO
fields:
# ...
lft:
type: integer
gedmo:
- treeLeft
rgt:
type: integer
gedmo:
- treeRight
lvl:
type: integer
gedmo:
- treeLevel
root:
type: integer
gedmo:
- treeRoot
createdAt:
column: created_at
type: datetime
gedmo:
timestampable:
on: create
updatedAt:
column: updated_at
type: datetime
gedmo:
timestampable:
on: update
oneToMany:
children:
targetEntity: MyEntity
mappedBy: parent
orderBy:
lft: ASC
manyToOne:
parent:
targetEntity: MyEntity
inversedBy: children
joinColumn:
name: parent_id
referencedColumnName: id
onDelete: "restrict"
gedmo:
- treeParent
tree problem:(reported by verify() method)
0 => "index [8], duplicate on tree root: 1"
1 => "index [9], duplicate on tree root: 1"
2 => "index [20], duplicate on tree root: 1"
3 => "index [21], duplicate on tree root: 1"
4 => "node [8], left is greater than right on tree root: 1"
5 => "node [10] left is less than parent`s [7] left value"
6 => "node [16] right is greater than parent`s [7] right value"
7 => "node [19] right is greater than parent`s [6] right value"
8 => "node [20] right is greater than parent`s [6] right value"
9 => "node [21] right is greater than parent`s [6] right value"
10 => "node [22] right is greater than parent`s [6] right value"
11 => "node [23] right is greater than parent`s [6] right value"
12 => "node [24] right is greater than parent`s [6] right value"
13 => "node [31] left is less than parent`s [30] left value"
14 => "node [35] left is less than parent`s [8] left value"
15 => "node [36] left is less than parent`s [8] left value"
table data

Answer 1

I've encountered exactly the same issue. Perhaps this answer will help someone else.
Gedmo/Tree with the nested set executes changes in leaf nodes before the deletion transaction begins. Therefore, even the transaction is rollbacked, the updated changes persist. To resolve that you should start the transaction manually before.
Ref. https://github.com/doctrine-extensions/DoctrineExtensions/issues/1062 & https://github.com/doctrine-extensions/DoctrineExtensions/blob/main/doc/transaction-safety.md

Answer 2

I found problem, when i delete a entity by $em->remove method, doctrine extension assume that onDelete=cascade for entity & change lft & rgt values of tree, then run query for removing of entity(and all children), but my entity have onDelete=restrict, then lft & rgt values are updated, but children is not deleted and this raise error in tree