New Bug Encountered: has behaviour of Attachment page Size picker changed?

Is it possible the Attachment Page Size picker been changed recently? I used to set it at A5 but now I have to set at A3 to see the same view in the pdf. A4 has not changed.
Thank you

Adding @Phil

I am not aware of any changes that would affect the Page Size setting. We simply pass the Page Size setting value along to PDF Rocket who does the HTML to PDF conversion.

Thanks and apologies for my confusion