You're not wrong. Can't believe I missed that. Thanks
However, there's more bad news:
Finding jaded slade regardless has uncovered a new critical bug. Civs don't have access to metals. It apparently just picks a plausible material at random when a civ does not have access to suitable materials, as seems to be always the case for formics' weapons and halflings' shovels. That's something we may need to work on too. It went unnoticed so far because halflings aren't supposed to have metals and when they randomly had meteoric iron it seemed plausible.
This has the following consequence specifically, showing how it's bugged: You get random material items at embark. If you remove your selection of that item (e.g. jaded slade shovel) then you can in no way select a new one or replace it.
With halflings this is semi-intended as they shouldn't have access to metals anyway, the problem is only they get those random shovels and the game insists they must be metal regardless of whether logically possible. Thus I can fix this pretty easily: add [STONE_PREF] just to be sure, remove [DIGGER:SMALL_SHOVEL_HLG] (can still be made at craftsman's via my custom reaction to make wooden shovel, and used). Since I'm forced to tinker around with halflings more I'm going to add some more flavor stuff too I hadn't figured out earlier:
entity:
[INVADERS_IGNORE_NEUTRALS][BANDITRY:1][ITEM_THIEF]
creature:
[NATURAL_SKILL:SNEAK:3]
[NATURAL_SKILL:PLANT:2]
[SKILL_LEARN_RATE:SNEAK:120]
[SKILL_LEARN_RATE:PLANT:120]
As for formics, I have no idea why they don't actually have access to metals and are forced to fall back on random picks. Maybe it's related to the problem of unarmed spider centaurs? Maybe not.
That said, yeah, it keeps happening, but please update & overwrite minimal world/BFEL pack when you have the chance/interest.
Edit: It's possible formics don't have access to metals because they aren't allowed to be furnace operators. One way how this could have happened is if you took part of my halfling professions. They don't get to have furnace operators so they don't get metal by default (can still train operators in fortress mode), but formics probably should be allowed that job. Just a guess, not that knowledgeable about entities.