Can be reproduced in the official demo: https://demos.telerik.com/kendo-ui/expansionpanel/api
1. Click on "Expand"
2. Try to Collapse by clicking on the Panel
-> Panel does not collapse, but gives a short animation and expands again.
Еxpanding/collapsing nested panels collapse the parent panel as well
Reproduction of the problem
Can be replicated in the following Dojo:
Collapsing or expanding a nested panel collapses/expands the parent panel
Collapsing/expanding the child panel shall not collapse/expand the parent
Kendo UI version: 2021.1.119