[LS] Underwear makes stomach disappear

Is it this specific underwear on your picture or any ?

Yes, it's only the underwear in the picture. All other underwear seem to be fine.

It has the same colour swatches as the Lovestruck ones, so I assume it's related to that pack. Strangely though, the masculine (when tags are removed) and feminine versions show up in CAS and can be selected, but the "bugged" version does not.

Here's what the selectable version look like:

There's no visual bugs and it fits both frames just fine. The "bugged" version doesn't show up in the CAS as a selectable item. The best way I can describe it is that it may work similarly to hidden items in CAS, where occasionally, randomly generated townies may show up in CAS content that has to be unlocked, purchased during gameplay, or obtained during specific events/scenarios.

I've looked at these in CAS and the male version only shows for males for me if I remove the male tag and not for the female at all.

Is that different for you ?

It shows up for female sims in CAS, with the feminine tag.

It does not show up for male sims, with the masculine tag.

This is what CAS looks like when I remove the masculine tag.

And this is what the "bugged" version looks like in CAS.

As you can see, it's not highlighted in a green box like in the previous images.

I have tested with and without mods, making sure to clear my game cache etc. Unfortunately, the issue is still there.

I think the broken version is actually the male version appearing on females when they shouldn't when you randomize.

Glad you see the same as me that the male ones don't show when you have the tag. 

Somehow it works cross-frame although they also look weird cause of the spine issue.