It seems Diablo 4 still has that infinite wave mode! Well, infinite wave bug, anyway.
A while ago we covered the bug, as the Hatred’s Hoard event in the Seething Realm of the Realmwalker is intended to have a 4-chest reward maximum. However, if you slay enough enemies quickly. Unfortunately, it seems if you exceed that 4 chest limit, you are doomed to farm more forever! Well. or leave.
Now it’s obvious why the bug hasn’t been fixed. This is Seething Realm-specific and that’s not coming back next season. And, considering the “popularity” of the whole Realmwalker theme, possibly ever. So if you want infinite monsters to kill, try to proc the Seething Realm event and go for it!