Arrow of harming bounced from slime block does so much damage it duplicates armor

If an arrow of harming bounced from a slime block hits the player that shot it while wearing comple armor with thorns 3 in all pieces, the player is extremely quickly damaged in sequence, causing instant death, spamming chat with death messages, and drops the player's armor multiple times (one for each point of durability of the armor).

Steps to Reproduce:

  1. Place a slime block on a sticky piston at least 5 blocks away from the player.

  2. The player wears complete armor with thorns 3 on all pieces and shoots an arrow of harming at the slime block.
  3. The player activates the piston and is hit by the arrow.

Observed Results:

It causes a lag spike and the player instantly dies even if carrying a totem of undying. The player drops multiple copies of their armor, one for each point of durability of the armor.

Expected Results:

The arrow does the normal amount of damage plus damage from potion effect.