Villagers lose their discounts when relogging while it is a zombie villager

The bug

When you cure a zombie villager to get discounts, and then turn him back into a zombie villager and then relog and cure him again, it will lose the discounts. They only disappear upon relogging when he is a zombie villager.

How to reproduce

1. Spawn a villager and make it link to a work station
2. Make sure to play on hard difficulty
3. Spawn a zombie to turn him into a zombie villager
4. Cure him
5. Use this to command to speed up the process:

   /execute as @e[type=minecraft:zombie_villager,distance=..20] run data merge entity @s {ConversionTime:0}

6. Turn him back into a zombie villager
7. Relog
8. Cure him again and use this command:

   /execute as @e[type=minecraft:zombie_villager,distance=..20] run data merge entity @s {ConversionTime:0}

   The prices will be as they were before, because he lost all of its discounts and then got one single discount through the curing process.