When you make a villager buy something with a custom name, you will not be able to successfully trade with the villager. In the client, it appears that the trade went though, but the items "rubber band" back into the player's inventory.

My guess is that the string when an Item has color is not exactly the same when comparing it in the Villager's inventory, or that maybe it's not being deserialized correctly

Summon Command for the Villager:

/summon villager ~ ~1 ~ {
VillagerData:

,
Invulnerable: 1,
PersistenceRequired: 1,
Offers: {
Recipes: [{
buy:

,
buyB: {
id: ghast_tear,
Count: 1,
tag:{
CustomModelData:204002,
display: {
Name: '

',
Lore: ['

']
}
}
},
sell:

,
maxUses: 9999999
}]
},NoAI:1
}

Command to summon the item:

/give @p minecraft:ghast_tear{display:{Name:'

',Lore:['

']},CustomModelData:204002} 1

Same commands do work in Vanilla Minecraft on a local world

Let me know if you need any other info!