Sidebar: Menu position issue

Webix JS
#1

If the sidebar elements are located at the very bottom of the page, the menu will be positioned incorrectly.

https://snippet.webix.com/wajv5l4v

https://imgur.com/a/TS7qanU

#2

up. (i need 20 characters… :()

#3

try this workaround
https://snippet.webix.com/f2u6z06h