Don't filter params and merge them back in later

By building the issue before filtering

app/services/issues/create_service.rb

@@ -4,16 +4,11 @@ module Issues
     include ResolveDiscussions
 
     def execute
+      @issue = BuildService.new(project, current_user, params).execute
+
       filter_spam_check_params
       filter_resolve_discussion_params
 
-      issue_attributes = params.merge(
-        merge_request_for_resolving_discussions: merge_request_for_resolving_discussions_iid,
-        discussion_to_resolve: discussion_to_resolve_id
-      )
-
-      @issue = BuildService.new(project, current_user, issue_attributes).execute
-
       create(@issue)
     end