Scheduler TimeLineView items overlap after grouping in vertical mode

[WissamProgress]

Scheduler TimeLineView items overlapping when using grouping with vertical orientation and rendering a custom view item.

Steps to reproduce:

1. Open this example where a custom view item is rendered and grouping is applied with vertical orientation - https://stackblitz.com/edit/react-h2kfzd-4ua2pc?file=app%2Fmain.tsx
2. Click Next then click Previous

The items are overlapping each other when returning using the previous button

As a workaround, you can set the group orientation to horizontal - https://stackblitz.com/edit/react-h2kfzd-lioyyr?file=app%2Fmain.tsx

Related to Ticket ID: 1600872