Every time I try to print an A6 (14.8 x 10.5 cm) document on A6 paper, the paper size reverts back to A4.
I'm using LibreOffice 7.3 (but the issue replicates in other word processors) - my page is set to A6 size, and print preview displays correctly. However, when I press print, despite setting the page size to A6 (custom), and the paper size to A6 (custom) in Printer Properties, it still prints as if it was A4. I've tried changing the default printer settings to A6 but this makes no difference. I don't have this issue if I export the document as a pdf and print from a browser, so I know my printer is capable of printing on A6.
Can anyone please help? It's driving me crazy!
Canon MX525 with latest drivers and firmware. Win10 x64