I was looking forward to the Drowned being added, but this is a bit ridiculous. My slime-hunting swamp is no longer useful for slime hunting, because slimes don't spawn anymore, just Drowned. Formerly I got at least one or two slimes within bowshot of my slime-hunting platform on prime slime nights; I have seen only one, total, since the update. I haven't seen a single zombie, enderman, spider, or creeper there, all of which used to be common spawns at night, and only one skeleton. It's all just Drowned.
IMO, the spawn on the things needs to be dialed way down, so that they're no longer the only mob to spawn in places like my slime swamp. (being able to spend more than a minute or two underwater near my base without being attacked would be nice, too, but I'd settle for having my slimes back)
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I'm all for having more mobs, but the drowned have replaced everything on my Win 10 realm. And in plains areas they fall into water holes and get stuck there and I've found as many as a dozen drowned all crowded together in a 10x10 water hole, and the same in adjacent water holes.
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However, this issue has been closed as a Duplicate of MCPE-34032.
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Same behavior on Xbox One v1.5.1. Three in-game days spent in a swamp, got one slime. Many, many Drowned however.