/damage command can wipe out item entities

This hour, my game closed for no reason and 'downgraded', i think. I created a kill-aura command block because i went on a beta version. I killed some animals, but after a while there's items disappearing in my range(I didn't talk about despawns).

Steps to reproduce:

1. Get yourself a purple command block (/give @s repeating_command_block)
2. But first drop items around. Make sure you can't reach them
3. Place the purple command block (Put always active then "execute @p ~~~ damage @e[type=item,r=3] 1 entity_attack entity @s")

Observed results:

Item entities disappear

Expected results:

Item entities shouldn't disappear to /damage but /kill because they doesn't really have health

 

Please check if compared to entity_attack item entities can disappear to other damage types.