Heyhey, hope all is well

This morning a user trying to add a petition to the app raised an issue that wasn't there couple days ago.

Un-identified users cannot Post on a form, event though the permissions are right in the model.

I'm getting the following error on models where unauthenticated users are normally aloud to post

Authentication credentials were not provided

The permissions related to this model are the following

anonymous_perms = ['add','view']
authenticated_perms = ['inherit', 'add']        

This is also occuring on other models. It seems like it's happening to all models that have a foreign relation to another model.

To illustrate what I mean, all the models bugging have the model "actiongroups" as a nested field. The anonymous perms on "actiongroups" are just in "view" mode. I think this is what's blocking, but really not sure.

The post on the models was tested & functional the end of last week, nothing changed on the app side & i've never really seen this error raised