When wanting to customize a villager with a command block, these are generated incorrectly regarding the number of items for trades: 

The command I use is:

 

/summon minecraft:villager ~ ~1 ~ {VillagerData:

{profession:fletcher,level:99,type:snow}

,Offers:{Recipes:[{buy:

{id:diamond,Count:33}

,sell:{id:emerald,Count:4},maxUses:999999,rewardExp:0b}]}}

 

As you can see in the photo, the villagers do not change the number of items and this did not usually happen in versions prior to 1.21 

If there is no error in this and the command language has simply been changed, please could you help me by writing the correct command. 

Thank you so much