Using Horse and Mule runtime identifier on custom entities causes the game to crash.

Partner Rank: 3-Normal

Partner Team Reporting: Panascais

Verification build: Version 1.16.20.54 build 4417012, Win10

Regression build: Unknown

Summary:
Using Horse and Mule runtime identifier on custom entities causes the game to crash.

Impact:
When you need to use hardcoded horse or mule behaviour it results in not being able to use a feature for a product.

Repro Steps:
1. Create custom entity with horse or mule runtime identifier
2. Try to enter a world with selected behaviour pack

Observed Result:
Game crashes.

Expected Result:
Game does not crash.

Screenshots/Videos attached: No