On a certain project I've noticed there's a problem when translating an already published node to a new language because of the view_unpublished module. Since there is no node grant entry in the node_access table, it fails. The check for this grant happens via \Drupal\Core\Path\Plugin\Validation\Constraint\ValidPathConstraintValidator::validate which ends up in \Drupal\node\NodeAccessControlHandler::checkAccess which then gives back neutral since there is no node grant giving access.
Uninstalling view_unpublished fixes the issue.
Issue 🐛 hook_node_grants implementations lead to a 'URL Alias' validation error when saving translated nodes. Fixed is the core issue and the patch from comment 64 fixes it on other projects.
Fixed
1.1
Code
The problem is in core and is 🐛 hook_node_grants implementations lead to a 'URL Alias' validation error when saving translated nodes. Fixed
Automatically closed - issue fixed for 2 weeks with no activity.