PDF Custom Template fails after update to v3.9

Hello, I have just updated one site via Joomla update system to Fabrik 3.9 and cannot generate PDF custom detail templates. It generates completely blank pages (PDF output incl. PDF debug) and filename is pdf.pdf instead of custom file name. Fabrik debug mode also does not generate any information.
We are in need of some funding.
More details.

Thank you.

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