As all pre-1.11 villagers generate into (villagers_v2) in 1.16.100, all functions remain the same EXCEPT trade refreshes. Converted villagers will not perform job and will not refresh their trades.

I made an example of a converted librarian villager(has a nametag just in case if it's relevant), it's trades are all out and the villager is placed in a 2x2x3 enclosure with a lecturn in the corner. The trades are out and will not refresh at all and in any time of the day.