Comment 4 for bug 1858091

The main change I can see in stable/train is the inclusion of API microversion 2.75, which made the API stricter and means you will now get a "400 error response for an unknown parameter in the querystring or request body" [1]. This is correct behavior from nova's perspective and it's rancher than needs to be fixed. You can get more information by looking at the body for the 4xx responses and the logs for the nova-api services.

[1] https://docs.openstack.org/nova/latest/reference/api-microversion-history.html#id68