I opened a chest from a ruined portal and it spawned a Cursed Armor but it didn't attack me. (I also tested it by spawning it with the egg). They also seem to burn.

Minecarft : 1.18.2
Forge : 40.2.0
Progressive Difficulty : 1.6.1

Hi, it has been fixed in 1.7.0 and this version is now available