I've set durability on almost every artifact, yet, it looks like it is not working.

no durability as shown in tooltip.

Also, I am getting this weird line in curios inventory

Durability is still working as intended, it seems the issue is purely visual. I've uploaded a patch that should fix the issue.

Is there any way to request that the durability is at least shown on the item so players don't think there is a bug when there artifact breaks/disappears?

That's currently not possible, but I'll reopen this issue as a reminder to add something like that in the next patch.

Thanks!

Seems like I forgot to close this issue, if an artifact has durability enabled it will now always show a durability bar.