In order to keep using the old naming rule, COMPOSE_COMPATIBILITY env variable was added here: https://github.com/docker/compose/pull/8655 However adding COMPOSE_COMPATIBILITY=true inside .env does not work. Only using the flag --compatibility flag works.
In order to keep using the old naming rule, COMPOSE_COMPATIBILITY env variable was added here: #8655
However adding COMPOSE_COMPATIBILITY=true inside .env does not work. Only using the flag --compatibility flag works.