I'm not sure if it's a bug or I'm the unlucky guy but on the server of my friend I was determined to go in the mansion and monuments but the cartographers do not propose me despite the multituples exchanges I make with them.

So I try with a second cartographer and he does the same thing as the first one.

I left the server to retry it solo in creative mode and the same thing happens

(Old dev version do the same things to me)