Mobs cannot be immune to freezing and infested at the same time

Mobs that are immune to freezing and infested through datapacks will only be immune to infested.

To reproduce:

1. Enable the attached datapack, adding chickens to the #immune_to_freezing and #immune_to_infested entity type tags.

2. Spawn a chicken

3. Splash the chicken with Freezing

4. Wait

5. Note that the chicken does not take freezing damage as expected

Code analysis:

LivingEntity.class

public boolean canBeAffected(MobEffectInstance newEffect) {
    if (getType().is(EntityTypeTags.IMMUNE_TO_INFESTED)) {
        return !newEffect.is(MobEffects.INFESTED);
    } else if (getType().is(EntityTypeTags.FREEZE_IMMUNE_ENTITY_TYPES)) {
        return !newEffect.is(MobEffects.FREEZING);
    } else if (getType().is(EntityTypeTags.IMMUNE_TO_OOZING)) {
        return !newEffect.is(MobEffects.OOZING);
    } else if (getType().is(EntityTypeTags.IGNORES_POISON_AND_REGEN)) {
        return !newEffect.is(MobEffects.REGENERATION) && !mobEffectInstance.is(MobEffects.POISON);
    } else {
        return true;
    }
}

If the entity is in the #immune_to_infested tag, the code only checks if the applied status effect is infested, and does not check whether the entity is also immune to other effects.