That happen to me some week ago too
Like gaspoweredpick wrote, you maybe not exposed to the sky 😉
I restart trade with new cartographer nearby a monument structure this time and... nothing again the cartographer have only 3 trades unlock
I found a bug in console version that seems pretty similar to my situation [MCCE-5865]
Where Rory Gatens wrote "No cartographer maps will be available if the structure(s) are not present in your world."
So I have use locate command and the game don't found Mansion and Monument nearby of my position... I will still add screenshots with F3 just in case
(Sorry if my english isn't great not my native language)
I have the same probleme and I try other texture pack and lava look always weird
J'ai le même problème mais je n'ai pas accès aux commandes je suis également sur un serveur créer par un ami la version du snapshot était à la base le 18w11a et on a migré a 18w14b.
J'ai lancé à partir de ma base une enderpearl à X:4000 Z:1200
Je me suis retrouver a proche de X:0 et Z:0
Je creuse... et bah je ne trouve rien! 😃
Sorry about my english, this is my second language