Exporting a selected PDF page results in a blank image

[NXTler]

Describe the bug
When you select an imported PDF page and try to export the selection, only a blank image is returned.

To Reproduce
Steps to reproduce the behaviour:

1. Import some PDF files.
2. Select one of the imported pages.
3. Go to export selected, give it some name and export in any format.
4. Look at export with any program.

Expected behaviour
I would expect the export to contain the PDF's content and any notes I have written onto it.

Desktop (please complete the following information):

• OS: Linux-Surface Arch
• App Version: rnote-git-0.11.0.r58.gd3758fb1-1
• Installation Source: yay AUR rnote-git
• Desktop Environment: LXQT
• Display Server: X11
• Input Source: Mouse, Stylus, Touchscreen

[Doublonmousse]

Does it only happen when exporting a selection (and not when exporting the full file ?).

Does it happen with a pdf file in particular ?

[NXTler]

It only happens when exporting a selection, or a certain page, not with a full export.
It didn't work with any PDF file I tried.