Custom template types (in add-ons)

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Creating custom template types (XF:Template::$type)through add-ons seems to be problematic during upgrades, as the importer seems to adhere to the structure's allowedValues (expecting either mail, admin, or public), throughout which add-on class extensions have yet to take effect.

Is there any way to silence structure constraints during add-on installation/upgrades?
Custom template types (in add-ons)

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