Corrupted PDF: unable to render preview from PDF compiled on docker pandoc/extra

[Tfloow]

Since a week or so, my pdfs have all returned corrupted. I can open the pdfs but there is no preview of them in the file explorer and I cannot upload them to any website.
When I check on github my pdfs appear "unable to render".
It seems like some sneaky block of metadata has appeared.

Here is my build routine

cd $@; docker run --rm --volume "$(PWD)/$@:/data" pandoc/extra summary.md LICENSE.md -o $@.pdf --template eisvogel --listings --number-sections

Two weeks ago all pdf returned fine and I didn't change anything in my build routine.