We have a custom written module (not by me), that uses entity_print to create PDF documents. It was working fine until I upgraded drush from 9.0-beta4 to 9.5 (had to update drush commands). The functions all look like they are working the same as before, but the PDF written to the public:// directory is a file with 0 bytes. When I look at the /tmp/ files created in the process, they have the correct data written to them. Any ideas or hints as to how to debug this?
entity_print module -> file_unmanaged_save_data writes a pdf with 0 bytes
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entity_print module -> file_unmanaged_save_data writes a pdf with 0 bytes
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