Do villager trades not change?

[ReservedWeb]

I cured a villager of being a zombie villager and placed a lectern down and now he wont change his trades after I removed the lectern, do they never change? It's been around 3 days since I removed the lectern and I got another villager and the same problem happens.

 

[Swervle]

No the villagers get their job and you need a new villager to get a different trade

 

[MegaCloud]

Intended feature, villagers cannot change jobs/trade once set.