Creaking has 1 health point so when player attacks Creaking that was spawned using spawn egg and deal less than 1 damage point, Creaking make player hurt noise. In example I just started fast clicking with empty hand to deal less than 1 damage.
MC-298676
Creakings from spawn eggs make player hurt sounds when attacked with damage less than 1
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I believe it works as intended, it uses the default entity damage sound when summoned like this