The problem is the following: if this jsreport project is on Docker, the pdfCreatePagesGroup and pdfAddPageItem doesn't works.
Note that if this repository is lunched on local (using npm install and node server.js) everything works fine.
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Download the repository
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Build docker image:
docker build -t mergingbug . -
Run docker image, for example:
docker run --name testbug --rm -p 3500:3001 mergingbug -
On jsreport application, run the Main report. This one will try to create groups, used for header. Code is the same on https://playground.jsreport.net/w/admin/Wy6stA8t
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Here is the bug: When the header try to use groups, those are null or empty. pdf.groups are created, but doesn't have any data.