Pretty much just the title. Even if Untamed Wilds and Citadel are the only mods installed, Whales when spawned in on servers make noise and have some form of collision physics, but don't have textures, models, or hitboxes

Seems to be a client-side issue. Sometimes whales are visible, sometimes they aren't. They can be visible for one person and invisible for another at the same time.

I just wanted to point out that I also get this issue in 1.20.1. I can see the whales fine in singleplayer, but when joining a server, they are invisible to me. All of them. I can hear them splashing around if they're on land, and I can see their drops, but I cannot see them at all. As far as I know I see all of the other animals. I really hope there's a fix to this because I love the whales in this mod. <3