So currently using CIT items in item frames with MoreCulling results in the item looking normal.
I've attempted to fix this myself although I don't seem to be able to get CIT to work correctly in my development area.

The fix should be as simple as doing the same mixins from here except for here instead.

GetModel Vanilla - MoreCulling
RenderItem Vanilla - MoreCulling

That should fix all the issues.

I'll keep this in mind for when the item type gets rewritten but for now there won't be a hotfix for the current state of the cit type.