Save as PDF leads to error message: Inkscape has received additional data

I was saving a pdf file, with the following settings (See attachment):

I should be getting no error message.

Inkscape 1.0 Beta, Mac OS X Catalina. 10.15.4

See attached. Has anyone else got this error?

Edited Mar 30, 2020 by Nathan Lee

To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information