I think it would depend on how you went about doing the install, but honestly I’m not sure. I run updates at semi-regular intervals so while my Manjaro install does have a package management GUI that tells me when things are out of date, I almost always ignore it.
What I’ve been doing for the past few weeks as I was playing with some unreleased stuff was I built the app locally and symlinked those files into my PATH so they would appear globally (ln -s ~/Projects/joplin/joplin/CliClient/build/main.js ~/.local/bin/joplin if you’re curious). That’s enough to solve my problem, but you may need more.
Also, here’s the PR with the fix to the PKGBUILD.