Model's Textures Break when Converting to Modded Entity

[dry elm]

Hello, I'm a Java developer, recently I've started a new project and to which my lovely wife has agreed to create and draw the models for.
However upon trying to animate it, it seems we couldn't create any keyframes or something, so we tried to convert to "Modded Entity" as on Google that was said we needed to convert to a modded entity anyways when I wanted to port it into Minecraft, however upon doing so almost the entire thing had its textures ruined and became a pot of mush.

Please help us figure out why everything seems to break when we convert from Generic Model to Modded Entity

[lucid jackal]

Welcome to the help forum!

Please make sure to read #1029373817119838218 as it may answer your question!

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[tulip pecan]

K, so for clarification:
You need Modded Entity if you wanna make a mod.
If you wanna use other means to get an entity ingame you need to use whatever format that method requires.

Generic Model allows for a lot of things, many of which aren't supported by Minecraft directly.
Modded Entiy has restrictions, like no decimal sized cubes and requiring box-uv and only using 1 texture