Versions

Ars Nouveau - 2.7.8
Tinker's Construct - 3.5.1.31
Curios API (Forge) - 5.0.7.1
GeckoLib - 3.0.38
Mantle - 1.9.27
Patchouli - 71.1

What happens:

There's a duplication glitch with the interaction between the crafting station and Ars Nouveau's Scribe's Table when placed next to each other in 1.18.2. It showed up in All the Mods 7 and I tried it again with only just the two mods and its dependencies. When placed next to each other the crafting station detects the scribe's table inventory. When you place a item with at least two ore more into that inventory and try to take it out with out shift-clicking it creates a new stack and lessens what's in the detected inventory by one.
Duplicate issue was created on Tinkers Construct git: SlimeKnights/TinkersConstruct#4994

For the record, all we do s access the item handler capability and use the methods from IItemHandlerModifiable. If your item handler is not going to behave properly when used in a UI, there is no reason to implement IItemHandlerModifiable. We also have a tag to blacklist it.

This bug looks to be caused by this very suspect code here: https://github.com/baileyholl/Ars-Nouveau/blob/1.19.x/src/main/java/com/hollingsworth/arsnouveau/common/block/tile/ScribesTile.java#L341-L346. I see no way that making a copy of the stack and shrinking by one will not cause dupes. A copy with stack size 1 (e.g. a stack.split) would work fine.

Has this been fixed for 1.18 or no?

no, fix only merged for 1.19

Fixed in latest

this got unfixed: FTBTeam/FTB-Modpack-Issues#5803

No, it did not get unfixed. It was clearly stated above this was only fixed in 1.19, not 1.18. For 1.18, just use the blacklist tag Tinkers' Construct provides and hope that nothing else triggers the dupe bug.