Java Edition:Vindicator Holding Invalid Axe
In early snapshots for 1.14, it was possible to obtain a vindicator holding a wooden or stone axe instead of an iron one.
Obtaining
First, kill a raid captain to get the bad omen effect. Then enter a village to start a raid. The reason that a raid has to be triggered is because the invalid axe vindicators only spawn in raids. Then capture any vindicator that you see and they should all be holding either a wooden or stone axe. To test this, go near the vindicator or put a villager near the vindicator. This should make the vindicator hold out its invalid axe.
Combos[test]:
There are 7 waves of vindicators, meaning that by chance, you can get vindicators from every wave in their data. You can also get them wearing banners, having an enchanted axe, and even riding on a ravager. You can also have them either holding wooden or stone axes.