Verification builds:
1.1.1.51 Retail

Summary:
Not every villager trade yields XP, as they do in the Java version. In the vanilla behaviour_pack, certain trades contain the property "reward_exp": false,, I will list them below.

Steps to Reproduce:

1. Trade wheat with a Farmer Villager

Observed Results:
No XP is given from the trade.

Expected Results:
Every trade should give the player XP.

Screenshots/Videos attached: Yes

Notes:
The trades that contain the property "reward_exp": false, are as follows:

• behavior_packs\vanilla\trading\butcher_trades.json
  • "item": "minecraft:porkchop",
• behavior_packs\vanilla\trading\cleric_trades.json
  • "item": "minecraft:rotten_flesh",
• behavior_packs\vanilla\trading\farmer_trades.json
  • "item": "minecraft:wheat",
  • "item": "minecraft:potato",
  • "item": "minecraft:carrot",
  • "item": "minecraft:emerald" ... gives "item": "minecraft:bread",
• behavior_packs\vanilla\trading\fletcher_trades.json
  • "item": "minecraft:string",