Oscar: 4.0.0
Haystack: 3.3.0
Solr: 8.11.4

In Oscar's BaseSearchView, form.get_suggestion() now returns None:

example: search: "bloos"

self.queryset.count(): 0

form.get_suggestion(): None

without passing the search term, it works:

BaseSearchView.get_context_data():

suggestion = self.queryset.spelling_suggestion()

Please have a look, maybe it's related to a newer Solr Version.