A bug/possible oversight leftover from the previous patch, but the trait reference list only includes monsters that you’ve summoned, or that you’ve got the creature material for. As there’s no indication in the summoning brazier for if you’ve summoned a creature or not, this is a bit annoying to try fix by summoning everything else. I’m assuming it’s not intended since you can still view summon-able creatures traits in the bestiary, they just don’t show up in the trait reference list for easy searching.
This is somewhat intended - it’s not ideal but the fix wasn’t retroactive, so you’d need to obtain mana for those creatures again (or summon them or fight them) in order for them to show up on the list.
Oh I see. Thank you for responding.