External data in a combo scrolling problems

https://snippet.webix.com/m/28d6n8ss

Using a DataCollection with external data in a combo leads to empty space on the bottom of the suggest list when scrolling on a touch device (tested on google pixel2)

Hello,

Unfortunately, we could not spot the issue. It can happen with dynamic list, still with a standard list everything goes smoothly.

GIF showing the problem https://gfycat.com/FickleUnfinishedCutworm

I colored the scrollbar and there are actually two scrollbars.

AFAIK the colored one shouldn’t be there on a mobile device