I spawn a Creaking and a Warden by spawn egg,then the Creaking was killed by the Warden.
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[media]
This is not a bug, it can also be reproduced in the Java Edition and should be resolved to "Works As Intended".
This is intentional per the changelog:
The Creaking Spawn Egg will spawn a Creaking mob that is not connected to a Creaking Heart. The Creaking mob will persist through day and night, loads and saves, and will take damage from attacks and other damage sources. It has one point of health (half a heart)