Suddenly, after trying some weird effects, shadings and deleting them, my object started displaying in the viewport as only mesh, disappearing in the camera but still renders completely fine.
I can't do further work without previewing.
Any guess on this?
Edit: For clarification, this is the normal Animation view, I didn't change anything from the default windows organization. Also I'll include another screenshot for you to see that it's not about the object position or anything.