Template: Blocks in placeholder-block not showing on created page

[TheMaaarc]

If you create a template with a placeholder block with blocks in it these blocks in the placeholder won't show on a page created with this template.

Template (expected on page that is created based on this template):

Actual page:

[nadar]

Note: We are talking about the PAGE DRAFTS - not blocks.

[nadar]

missing prev_id reset: https://github.com/luyadev/luya-module-cms/blob/master/src/models/Nav.php#L611-L616