Silverfish no longer take damage from trident killers using trapdoors and fences

In the latest Bedrock update (1.21), silverfish no longer take damage from passive trident killers that use trapdoors opening/closing to move them through a static trident. This breaks many XP farms. Other mobs like zombies or slimes still work. This seems to be related to a possible hitbox or collision change for silverfish or fences. Likely a bug, as it is undocumented.

• Steps to Reproduce:

  1. Build a trident killer with trapdoor and fence setup.

  2. push silverfish with water to the trident killer as in the picture

  3. Observe that they do not take damage from trident.

  4. Try with zombies to compare.

• Expected Result:

  Silverfish should be damaged and killed like other mobs.

• Actual Result:

  They remain unaffected by the trident, breaking XP farms.