A user can select the device used to "view" a page ("Any device", "Desktop", "Tablet", or "Phone"). Whenever a new page is selected in the sitemap, the selected device is reset to "Any device". Reproducible in both the community and enterprise edition.
Steps to reproduce:
- Open a channel
- Change the device in the top bar (e.g. to "Phone")
- Open the left side panel
- Select another page in the sitemap
Expected: the selected device remains the same
Actual: the selected device is reset to "Any device"
Cannot be reproduced in version 11.2, so the issue is probably introduced in the 12.x range.