The converter doesn't seem to be retaining any information on villagers that I put in. Names and trades are reset when I retrieve the finished villager.

Oh, that's really bad. Thanks for reporting.

Not sure if it's related, but I also picked up a villager with a trade history, and when I put them down, I got a whole new villager (new name, no data). I do not recall for sure if it was a More Villagers villager, or a Vanilla villager.

(I feel like V in V for Vendetta introducing himself in a most verbose and voracious manner)

The ones that affect Villagers are:

villagernames-1.18.2-4.0.3.jar
simplevillagers-1.2.0.jar
infinitevillagertrading-1.18.2-fabric0.47.10-1.1.jar

That last part did work before 1.2.0

Could you post the mods you're using? This sounds as a conflict, as this has been tested numerous times (using only simplevillagers though).

What happens if you remove infinite trading?

Same. I can give you the list of all the mods.

Couplings-1.8.0+1.18.2.jar Croptopia-1.18.2-FABRIC-1.8.3.jar FallingTree-1.18.2-3.4.1.jar Patchouli-1.18.2-67-FABRIC.jar better-signs-and-frames-0.8.3.jar cardinal-components-api-4.1.4.jar carpet-extra-1.18.2-pre2-1.4.64.jar chainsuspension-1.1.0.jar chestrefill-1.0.0_fabric.jar cloth-config-6.2.57-fabric.jar copperhopper-0.0.5+1.18.1.jar disguiselib-1.2.1-fabric.jar expanded-weapon-enchanting-1.0.2.jar fabric-carpet-1.18.2-1.4.66+v220228.jar fabric-language-kotlin-1.7.2+kotlin.1.6.20.jar fabric-tree-chopper-0.8.5.jar fantasy-0.4.4+1.18.2.jar feature_nbt_deadlock_be_gone_fabric-2.0.0+1.18.2-rc1.jar ferritecore-4.2.0-fabric.jar graves-2.0.0-rc.5+1.18.2.jar grind-enchantments-1.4.0+1.17.1.jar lazydfu-0.1.2.jar ledger-1.2.4.jar malilib-fabric-1.18.2-0.12.1.jar modmenu-3.1.0.jar morecmds-1.4.1.0+1.18.jar morevillagers-FABRIC-1.18.2-3.2.0.jar mostructures-1.4.1+1.18.2.jar 'phosphor-fabric-mc1.18.x-0.8.1 (1).jar' phosphor-fabric-mc1.18.x-0.8.1.jar placeholder-api-1.1.3+1.17.1.jar player-pronouns-1.4.0+1.18.jar polydex-0.1.2+1.18.2.jar polymer-all-0.2.0-beta.37+1.18.2.jar qsl-1.1.0-beta.6_qfapi-1.0.0-beta.10_fapi-0.51.1_mc-1.18.2.jar repurposed_structures_fabric-4.0.2+1.18.2.jar servercore-1.2.8-1.18.2.jar simplequests-1.18-1.0.0-fabric.jar simplevillagers-1.2.0.jar styled-chat-1.2.3+1.18.jar styledplayerlist-2.1.3+1.18.jar villagernames-1.18.2-4.0.3.jar watson-fabric-1.18.2-1.14.2.jar

Ok, think I've narrowed it down. If I pick a villager up into one of my hotbar slots, it retains the NBT info. If I pick them up and they go directly into my inventory, they get grabbed as Picked Villager, and they no longer have any saved info.

Huh, that's so strange, but thanks for narrowing it down. I might have some time tomorrow to test it.

I've managed to fix the pickup issue, however, the curing works normally for me 🤔 ...

It was probably the same issue. I'd pick up a villager, lose the NFT, put them in the converter....