Some built-in entity models are missing

[Realbizzy]

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Issue description

Ok so i made a Salmon mob and I selected salmon model but when i tested my mod it standing on 2 legs and had 2 arms like a player, how do i fix this? I reported this on the forums and they told me to make an issue so here i am!
Image below for problem

How to reproduce this issue?

I put a salmon texture into the entity element making thing and selected salmon model but yet its still a biped model

Operating system

Windows

Details

MCreator version: 2023.4
Game Version: 1.20.1
Generator: Fabric

Example workspace

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Logs

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