I'd like to report that my issue linked in Duplicated item was not fixed:
Closed bug: https://feedback.telerik.com/kendo-angular-ui/1484071-scheduler-event-editor-recurrence-editor
My bug marked as duplicate: https://feedback.telerik.com/kendo-angular-ui/1657303-scheduler-some-events-are-incorrectly-duplicated-despite-the-rules-written-on-them
It can still be reproduced in new version 17.3.12
https://stackblitz.com/edit/angular-pusn73-en4gpcjt?file=src%2Fapp%2Fapp.component.ts
The event with recurreneRule that suggests that this event appears on each Tuesday till 20201014 is visible on Wednesday 14th.