When you have multiple groups of maps and you use Tiered or Grouped map vote types they will stop working if one of these categories runs out of maps (either because they're banned or they don't fit the playercount), the mapvote will correctly default to the category that still has maps directly, however once a map gets picked it fails to change to that map.

In group vote it shouldn't even default to a mapvote within the category it should just pick one.

In tiered vote it does follow the correct behavior but it fails to change to the map that gets voted.