[Bug - models] Minecart model incorrectly shows for all minecart entities in 2.4.0+

[helpimnotdrowning]

Describe the bug
In versions prior to 2.4.0, the minecart model would only show for the base minecart entity and leave other minecart entities unchanged (2.2.6)

In 2.4.0+, the model is applied to all minecart entities. (the minecart chest model is also broken, this may be related to #232) (2.4.0, 2.4.1)

List and link to broken resourcepacks
https://modrinth.com/resourcepack/dooby-train-minecarts

Expected behavior
What should it look like in OptiFine? screenshots?

(please complete the following information):

• Minecraft Version: 1.21.1
• EMF version: (Fabric) 2.2.6, 2.4.0, 2.4.1
• Optifine: 1.21.1 HD U J1 + Forge
  52.0.16