I'm not sure if this intentional or not but a ton of the primary effects just aren't working for most equipment & certain weapons (mainly the devil weapons & weapons that give start of turn healing).
& after looking at the game in a hex editor, I noticed that "Skill Property 1" is disabled for all the above mentioned. So like I said before, not sure if this is intentional, but just making sure since I found it weird that none of the descriptions were changed & values were still set just not active.