Updated timezone offset to -5h (UTC-5) in date-streaks helpers.js via patch package
Updated patch-package kept having errors at build time - had to reinstall package, then delete cache, build, node_modules folders in my Strapi app, clear build cache in Heroku, added npm_config_production=false to Heroku config vars.
I think deleting the node_modules was the key.
I think deleting the node_modules was the key.