Many extensions from the appimage of inkscape 1.0rc1 doesn't work

Steps to reproduce:

• open Inkscape
• click in almost any extension from the topdown list on Extensions (by example Render-> Random Tree or Render -> Mathematics -> LaTeX(pdflatex) or JessyInk-> Autotext or Color -> Grey scale, etc...)
• then nothing happens

Inkscape Version and Operating System:

• Inkscape Version: inkscape 1.0rc1 from appimage file
• Operating System: kubuntu 19.10