Importing a WXR with Site Editor templates should work

[akirk]

When importing a WXR with the importWxr step, a post might be a template created with the site editor. Those need to be associated with the theme slug in the wp_theme taxonomy. For this they contain this entry in the wxr:

<category domain="wp_theme" nicename="adonay"><![CDATA[adonay]]></category>

Unfortunately, this term relationship is not properly established, thus making it impossible to restore a Site Editor template.

[zaerl]

Yes, this is part of the new topological sort we must add to the project. Once added, all the relationships between terms/posts and custom posts will be fixed.