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Wordpress version: 5.5.1
WooCommerce version: 4.5.2
This code is at the top of each pdf “invoice” and “packing slip” generated and viewed in google chrome. Also if downloaded as zip it will not open. Below this code seems to be what a pdf would look like rendered in html. ex: (%PDF-1.7 %���� 7 0 obj) We have another site with a lot of the same plugins and it works fine. But we have gone through and deactivated most plugins to find a culprit without success.
If anyone has any ideas or thinks they could help but needs more info please let us know.