ParentAnimation within ParentChange doesn't work totally

ParentAnimation within ParentChange doesn't work totally.

This issue can be reproduced with the Qt Example :

Qt\Qt5.15.2\Examples\Qt-5.15.2\quick\views\delegatemodel\slideshow.qml

When the state changes from "inList" to "inDispaly", there is no animation,  all  the x/y/width/height are changed with no transition(No delay ).

When the state changes from  "inDispaly" to "inList", the animation is OK.