Add these lines after level waittill prespawn in obj_la_patrouille_2.scr:
$world farplane "3500"
$world farplane_color "1 1 1"
In the few custom maps I have this issue with (limited vision radius), I almost do the exact same thing as bulldozer, however I only add 1 line after 'level waittill spawn' (not prespawn), which is:
And that always has fixed it for me.$world farplane 20000
Thanks for your help, problem solved