\Drupal\experience_builder\Controller\ApiAutoSaveController::post is doing a lot of juggling depending on the type of the autosave entry.
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Allow CMS Author to set site's homepage from navigation
Postponed
will add another case.
We should consider making the return type from the autosave manager value objects instead of associative arrays.
These could then hold the logic for each type e.g. -
* ContentEntityAutoSaveEntry
* ConfigEntityAutoSaveEntry
* PageTemplateAutoSaveEntry
* SimpleConfigAutoSaveEntry
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Page builder
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Page status changes from "Published" to "Changed" even when no actual changes are made
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effectively does this because the new code is just $entity->validate() then $entity->save() when we stop storing arbitrary values in autosave and instead store entities.