The Vindicator with the tag Johnny do attack ravagers which indicates that ravagers are not considered as illager. They're also attacking witches, which means they're also not categorized as illager while they're in the raids. 

A Vindicator with the tag Johnny will attack another illager if they are not both in the same team. (for this I do not know if it is really a bug, if it is intended behavior or if it is by chance but this ability is very practical it allows to create battles between two armies)

I know this Johnny story is a reference to Shining but it would be really great if this tag or something like could be applied to all entities