In the API documentation for node_permissions_get_configured_types() it says:
To exclude a specific node from getting permissions defined for it, set the
node_permissions_$typevariable to 0.
This is correct for Drupal 7, but not correct for Backdrop. From looking at the code, it is referring to the setting "$info->settings['node_permissions']" which would be specified in the node definition originally passed tonode_type_save().
I think this also should be documented in a change record.
What's my next step for reporting/fixing this?
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You can use Rules or the Node Notify module for comments. When a new account is created, I believe there are Rules to send.
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