Item entity health does not decrease uniformly when on cactus with tick stepping

Short description
When an item entity is summoned on a cactus and the game is tick stepped, its health decreases irregularly instead of uniformly to 0 within the expected 5 ticks.

Steps to reproduce

1. Freeze the game with /tick freeze.

2. Summon an item entity at a specific position on a cactus (e.g., using /summon minecraft:item ~ ~ ~ {Item:{count:1,id:"minecraft:sand"},PickupDelay:40}). Ensure the cactus is placed so that the item spawns in contact with it (e.g., directly above or inside the cactus block).

3. Check the item's health using a command like /execute as @e[type=item,distance=..5] run data get entity @s Health.

4. Step forward 5 ticks with /tick step 5.

5. Repeat steps 3–4 multiple times (e.g., up to 15 ticks total).

Expected result
The item entity's health should decrease uniformly from 5 to 0 over the course of 5 ticks, and the entity should be removed (due to cactus damage) after 5 ticks.

Actual result

• Initially, the item entity has health 5.

• After 5 ticks, health is 3 (decrease of 2).

• After 10 ticks, health is around 1–2 (decrease of 1–2 from previous, not consistent).

• After 15 ticks, some entities have health 1, while others have already been removed (deleted).

The health decrease is not uniform, and the removal timing is inconsistent across entities.