Admin Panel blank after upgrade from v3.5.1 to v3.6.5

It’s been some time since I’ve used Heroku, and I don’t remember what you can and can’t do there. (I’m running my Strapi backend on an AWS EC2 instance.) It’s pretty much all NPM, but I just now use yarn for the INSTALL step:
[log on to server and navigate to project subdirectory]
git pull
npm install → white admin page // yarn install → good admin page !!!
NODE_ENV=production npm run build
cd…
pm2 unstartup (then paste and run generated command)
pm2 startup (then paste and run generated command)
pm2 start ecosystem.config.js
pm2 save

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