Summary:
Models of the Wither and Iron Golem in spawners do not correspond to the Java. Iron Golem has a cracked texture, and the Wither has an aura. In the spawners, the Iron Golem should have a standard texture without cracks, and a Wither without aura.

Steps to reproduce:

1. Place spawner.
2. Place the Iron Golem and Wither into it.

Observed results:
Iron Golem has a cracked texture, and a Wither of aura.

Expected results:
Iron Golem has a texture without cracks, and the Wither will be without an aura.

Screenshots:
Java

Bedrock