Villagers & Wandering traders don't take jobs or have trades.

When overriding vanilla Villagers & Wandering Traders, they do not have trades and villagers don't accept jobs.

Override Villagers & Wandering Traders in VanillaMobs.yml

VILLAGER:
  Health: 20
  Options:
    HasTrade: true
    PreventRenaming: false
    PreventTransformation: false
WANDERING_TRADER:
  Health: 20
  Options:
    HasTrade: true
    PreventRenaming: false

Reload/Restart, try to trade.

Players are unable to trade or make villagers accept jobs.

https://mclo.gs/XW17Ofu