Suggestion to install Discord to an app folder somewhere in the home folder so Discord can proceed to launch after an update:
The default installation for Discord is to /usr/share/discord/
The problem with this is Discord will fail to upgrade when an upgrade is available and then will not launch.
System packages will never install anything in one’s home folder.
As far as Discord, it cannot be upgraded within the application on Manjaro regardless as it will prompt to install the .deb for Debian, Ubuntu, etc.
FYI, I normally push the update within 24 hours of release. If you can’t wait, then please see Discord asks for an update not yet available in the repository