An error write EPIPE occurred while loading Heroku PostgreSQL database from the local database.
heroku addons:create heroku-postgresql:hobby-dev
heroku pg:push postgres://localhost:5432/design-sa-1 DATABASE_URL --app design-sa

Appeared only recently, before this was not.
My system Windows 10, local databases v.11 or v.12 - the result is one - this error. I have already tried it on two old applications - the result is one – this error.
The applications themselves (Django 3.0/ Python 3.7) are deployed on Heroku without errors.
Local python manage.py dumpdata > db.json works perfect.