Probably relates to MC-50129, but I think it might be a different issue.
When I was making a model for the ender pearl and eye, the transparent outer part of the model made the inner parts of the model invisible.
Again, this probably relates to MC-50129 but I'm not entirely sure.
EDIT - Similar things to MC-50129 happen in the achievement menu, as the inside of the ender eye renders outside the outer cube.
Linked issues
Attachments
Comments

Yes. Adding cullface did fix the problem. Thanks.
maybe has something to do with "cull"?