The Mooshroom's mushrooms have invalid rendering and generation

The Mooshrooms their mushroom are rendering and generating invalidly

To first describe what happened It started out with me wanting to see what the new baby mobs look like I choose the Mooshrooms to test. I spawned a lot of Mooshrooms and If you look at the screen shots you will see what happened. I relogged the game and the mushrooms rendered but when I went to access my inventory the rendering for the mushrooms turned black again when I hit the escape key the mushrooms stayed normal. Then later the render got lost and when I hit escape the mushrooms get their render back. Steps to reproduce

1. Create a new world and toggle the first drop of 2026 make sure you are in creative mode

2. Spawn the Mooshrooms

3. Observe what happened