**Kibana version:** 7.12 BC2 **Describe the bug:** If legacy rendering is disabled, partial bucket markers ("endzones") are not rendered anymore **Steps to reproduce:** 1. Go to Visualize, create new xy chart 2. Configure date histogram on the x axis 3. not rectangle annotations at the beginning and the end are shown **Expected behavior:** Partial buckets at the beginning and the end should be shown **Screenshots (if relevant):** vislib: <img width="164" alt="Screenshot 2021-02-25 at 14 11 48" src="https://user-images.githubusercontent.com/1508364/109159206-a7cbe000-7774-11eb-852d-3ca4afa8c605.png"> elastic-charts: <img width="131" alt="Screenshot 2021-02-25 at 14 11 55" src="https://user-images.githubusercontent.com/1508364/109159214-a995a380-7774-11eb-942b-9172bd0d058c.png">
Kibana version: 7.12 BC2
Describe the bug: If legacy rendering is disabled, partial bucket markers ("endzones") are not rendered anymore
Steps to reproduce:
Expected behavior:
Partial buckets at the beginning and the end should be shown
Screenshots (if relevant):
vislib:
elastic-charts:
