Elite Sunspear set bug?

I thought that all max Nightfall-based armor sets have insignia slots, but I just bought Elite Sunspear boots and it came with a +20AL vs Physical bonus, no insignia slots. I went to GuildWiki and it says that it uses insignia slots, just like other armor sets. What's going on? Did I just lose 15k for something half useless?

Just try put an insignia on it, you won't have a problem.

It's just not labelled as insignable.

are the boots are a warrior? if it is, all warrior armor has that. u can still add an insig