The update from v1.0.1 to v1.1.0 introduced "support for `nonce` and `state` parameters during authorization code flow", but that support was buggy so the login broke.
The following release, v2.0.0, fixes that bug: "Fix some errors relating to how state and nonce parameters were handled in the django integration."
The breaking change should hopefully not affect Bitpoll and everything seems to work when using OpenID.
See the changelog for more: https://github.com/fsinfuhh/py_simple_openid_connect/tags