Broken shulker NTB data in 1.14+

So I got some shulkers full of (pretty much illegal lol) stacked stuff. Until 1.13.2 I could place them and looking in them and take/place other items and taking them back without any problems. With 1.14 if I place the shulkers in survival I can place them and look inside but if I take them back the content is kinda unstacked/broken in a weird way. Plus, if I place them in creative the name of the shulkers is missing after being taken back.

 

Thank you for listening!

P.S. items are being created using external programs.