Maps have been deleted after I placed them in item frames.

I fully explored 3 level 4 maps. I then placed them in item frames. I exited the world and when I logged back on the maps were gone. They're not in my inventory, ender chest or shulker boxes. I have all the loot from the areas I'd explored just not the maps. Wouldn't be that much of a big deal except I'm playing survival, needless to say this is a massive pain.