The bug
The infested potion effect has a 10% chance to spawn 1-2 silverfish when the affected entity takes damage. However, in Bedrock Edition, incoming damage that is ignored due to the damage immunity frames also rolls this 10% chance. This makes constant sources of damage like magma blocks spawn silverfish like crazy, even though the entity only takes damage once every half-second.
How to reproduce
Build a small platform of magma blocks
Spawn an iron golem on it
Throw a splash potion of infestation on it
Expected results
The golem should occasionally spawn silverfish at the same time it takes a point of damage
Observed results
The golem rapidly spawns silverfish continually
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