Some map prefixes are not being used

[TechnoSam]

I have a weird situation where I loaded a bunch of maps into my workshop collection but I only want to use a handful of specific maps in the vote.

I am using the MapPrefixes key like a whitelist and passing in a list of all the map names that I want to use, but there are a few that never show up in the vote, even if they are the only ones in the list.

For reference, here's my config:

{
  "RTVPlayerCount": 3,
  "MapLimit": 4,
  "TimeLimit": 30,
  "AllowCurrentMap": false,
  "MapPrefixes": [
    "TTT_Waterworld_Remastered_2020",
    "ttt_mcvillage_V6",
    "ttt_Clue_se",
    "TTT_Nightmare_Church"
  ],
  "MapsBeforeRevote": 3,
  "EnableCooldown": true
}

Here are the workshop pages for all those maps:
TTT_Waterworld_Remastered_2020
ttt_mcvillage_V6
ttt_Clue_se
TTT_Nightmare_Church

I've verified that each map has the correct name and can be loaded. I can start the server on those maps and manually change to any of them and they all work fine.

When I run this config, after finishing a map, I see the mapvote screen, but it's empty, there are no voting options. In the server console, I don't see any errors. After the vote times out, I get a message that says

changelevel <levelname> : continue game on a new level

and then it hangs forever until I manually change.

I checked recentmaps.txt and it seems to be operating correctly. After forcibly switching to a map, the map does appear in the list. I also tried clearing it just in case something was getting hung up, but the behavior didn't change.

I also tried deleting the last few characters from each map name in the config, but that didn't change anything. And it hasn't caused problems for any of the other maps I use. Therefore I don't think my weird use case is causing problems, even if I use just using "ttt" and "TTT" as my prefixes, I suspect that these maps would still never be chosen.

What could be going on here? Do I have something configured wrong? Is something wrong with the maps or the names? Or is there a bug in mapvote?