The Villager Editor book allows changing career of a villager, but there is no change to the trades the villager offers after changing their career.

Steps to Reproduce

1. Examine career label and trade offered by a villager
2. Cheat in villager editor book and right-click on that villager
3. Press the Randomize Career button and then the Set Career button and close GUI
4. Re-examine the trades offered by that villager

• Minecraft Version: 1.12.2
• Forge Version: 14.23.5.2854
• MCA Version: 6.1.0
• Launcher: MultiMC

Mods List (testing environment)
JourneyMap
Just Enough Items
Minecraft Comes Alive
Simple Storage Network