While these classes are intended for admin use, there are developers out there who include `wp-admin/includes/template.php` to access them in other contexts. There is no intention to continue to support this indefinitely, but a breaking change like that would need to happen very early in a cycle and communicated loudly.
In the meantime, if you're reading this commit message and you do the above, please update your code to not do that. Thank you :)
fixes#33413.
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