Hi @Menachem35 It looks like you may have hit this edge case, which was fixed in 17.0.
This problem is regarding using Document Types that varies by Culture and that has Properties that Varies by Culture as a Composition on a Document Type that does not Vary By Culture.
I can gladly inform you, the data was never gone, it just didn’t show up in the UI.
There is no reason to stay behind on any version of v.16. V.17 brings almost no breaking changes(expect a newer version of DotNet) but you get a ton of fixes, so get your project up on latest when possible.
Good luck with your project.