Consider the soon-to-be-attached document. It has a single page, with the Left Page style. Never mind what you think of that style and its behavior - as things are defined right now, this page triggers the insertion of a blank page before it. You can see the blank page if you switch to Book View (e.g. via the bottom-of-window toolbar buttons). Now, if I export the document to PDF, and enable "export automatically inserted blank pages" in the dialog, I get a two-page document beginning with... not quite a blank page, but rather a blank page plus a green page border, like the Left Page style has defined; other features of the Left Page style are not applied (which is intended behavior).
Created attachment 193837 [details] Document for which exporting triggers the bug Exporting this to PDF results in a PDF with the blank page having a green page order.
Created attachment 193838 [details] attachment 193837 [details] - exported to PDF Export to PDF - note green page border on first, otherwise blank page.
I saw this with: Version: 24.2.0.2 (X86_64) / LibreOffice Community Build ID: b1fd3a6f0759c6f806568e15c957f97194bbec8f CPU threads: 4; OS: Linux 6.6; UI render: default; VCL: gtk3 Locale: en-IL (en_IL); UI: en-US and also seeing this with: Version: 24.8.0.0.alpha0+ (X86_64) / LibreOffice Community Build ID: ffccbf4762a9ae810bcdd21c41fccdd436e7bfc9 CPU threads: 4; OS: Linux 6.6; UI render: default; VCL: gtk3 Locale: he-IL (en_IL); UI: en-US But note that I don't get this with just _any_ PDF with Left Page style applied to the first page. Can't quite pin down what makes this one trigger the problem.