Tor Browser breaks rendering of fonts in applications launched from Tor Browser

Tor Browser adds few additional environment variables which breaks kdialog and likely other applications also:

FONTCONFIG_PATH=/home/user/tor-browser_en-US/Browser/TorBrowser/Data/fontconfig
LD_LIBRARY_PATH=/home/user/tor-browser_en-US/Browser/TorBrowser/Tor/

screenshot: https://i.imgur.com/1ItY3jR.png

(This issue was originally reported against QubesOS.)

Perhaps do not modify environment variables for applications launched from Tor Browser?