Ch00chinat0r You can't just use !map to rotate to a map on T6ZM. Treyarch made the system to pick what specific map and gametype very complicated. There are four dvars that need to be set to properly set the map on T6ZM.
ui_zm_mapstartlocation
g_gametype
ui_zm_gamemodegroup
mapname
The configs in gamesettings have all these dvars preset for the specific map, but unfortunately T6 doesn't support using the exec command outside of an sv_maprotation so you'll need to enter them in manually like this:
ui_zm_mapstartlocation "rooftop";g_gametype "zclassic";ui_zm_gamemodegroup "zclassic";map "zm_highrise
just paste that entire line and the map will change properly.