Yes, that is correct. The applied_tax does have a tax_uid that relates to the uid of the order’s tax. In this case the uid matches the catalog_object_id for the tax due to the Square Online Store application that created this order. This is managed by us and this order was created on a previous version of the API when orders were created this way. I’ve shared this with the team however you should expect that some tax uid will match the catalog_object_id of the tax in the catalog. 
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