Can't get Heroku to load this buildpack

[jesshmusic]

I am trying to deploy a React app using the create-react-app-buildpack that needs to load puppeteer dependencies for react-snap.
When deploying I am getting this error, which actually seems to freeze the build process on Heroku:

(node:629) UnhandledPromiseRejectionWarning: Unhandled promise rejection (rejection id: 1): Error: Failed to launch chrome!
/tmp/build_2e66391b352738bb3c9a1b44c5632458/jesshmusic-living_music_database-ca09d15273a13f10f1a1a9e7ffd147503a55dc26/node_modules/react-snap/node_modules/puppeteer/.local-chromium/linux-499413/chrome-linux/chrome: error while loading shared libraries: libXss.so.1: cannot open shared object file: No such file or directory
TROUBLESHOOTING: https://github.com/GoogleChrome/puppeteer/blob/master/docs/troubleshooting.md
(node:629) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

I have attempted to add the puppeteer build pack as described in the troubleshooting link above but it doesn't do any good.
As a matter of fact Heroku does not load the buildpack at all.
My Heroku build packs are listed as:

1. https://github.com/mars/create-react-app-buildpack.git
2. https://github.com/jontewks/puppeteer-heroku-buildpack.git

[jontewks]

@jesshmusic can you try it with the puppeteer buildpack first in the list? I remember someone mentioning that order mattered when installing dependencies. Other than that I don't think I'll be able to help out, since this issue is getting another buildpack to run correctly and not just puppeteer.

[jamesmosier]

For what it's worth, order helped fix this error for me. I had to put the puppeteer buildpack before the Node buildpack and then it worked!

[jontewks]

Thanks for the info. Interesting that on our production use of it we have my buildpack second:

I'll definitely keep it in mind about potential troubleshooting solutions though if people are experiencing weird issues in the future.