Only noticed in FE8 (though i haven't checked others), but more than a few times i've noticed that the randomizer-added abilities of weapons just aren't showing up (specifically noticed with the slim lance doing half health, but i believe all or most weapons were having the same problem in the game).

Specific options and seed i had when noticing this is here: https://imgur.com/a/nDhnsR5