When you approach certain mobs, hostile or friendly, they instantly duplicate. It doesn't happen every time, but quite often.
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It's possible. But it's curious that the newly created mob has the same item. For example: A zombie spawns with a sword, helmet, or other identifiable item, and the duplicate or new spawn comes out with the same item.
I don't have a recording. However, to add some information, it only happens when you approach the race directly towards the mobs. Like a loading error in the chunk. Similar to when duplicating arenas or generating a trader farm.
Let me explain. I play at a distance of 8 chunks. I see the mobs from a great distance. I run towards them, and when I'm one or two chunks away, like a loading glitch, the hostile or friendly mobs duplicate. The funny thing is, they always spawn the same mobs, and if they have items, they spawn with the same item.
When it happens. Which, as I've already mentioned, isn't a constant, but a variable I've observed after playing the Switch 2 Beta for several days.
Have those mobs just spawned in? As bedrock edition pack spawns spawn mobs in the same spot (something that was reported and marked as works as intended).