PDF export for wide tables fails

We use Confluence for our tecnical documentation. We often use large tables to give an overview over use cases for products etc. We know want to make those documents available for our customers. Therefore we paid a Atlassian Premium Partner to define an pdf layout according to our corporate design etc.

After finishing we noticed that while exporting to a pdf everything looks good but wide tables did not get scaled. The table simply gets cut off. That means that there is a loss of data during the rendering process making the pdf export basically completely useless! After complaining to our Atlassian Premium Partner they told us that this issue cant be resolved via pdf stylesheet or anything else and we should report this as bug.