create a page and publish it
create a page and don't publish it
create a page and switch to mosaic view and hit "edit"
now customise the mosaic layout and add a "existing content" tile
navigate to the published page object and hit save.
all is fine
doing the same (add existing content) with a private page object will throw an error:
WARNING plone.jsonserializer Constraint not satisfied for value "80f986547d504295b2ef24309b338457" of field "content_uid". Returning None instead.
WARNING plone.jsonserializer Deserializer not found for value "80f986547d504295b2ef24309b338457" of field "content_uid". Returning None instead.
don't mind the uid in particular; see it as a sample.
no content of that page is shown in the mosaic editor but after saving, that content is visible.
to reproduce:
create a page and publish it create a page and don't publish it
create a page and switch to mosaic view and hit "edit" now customise the mosaic layout and add a "existing content" tile navigate to the published page object and hit save. all is fine doing the same (add existing content) with a private page object will throw an error:
don't mind the uid in particular; see it as a sample. no content of that page is shown in the mosaic editor but after saving, that content is visible.