Only a few Dynamic Monuments work on Last Train 1.5.5 Map

Through the last few updates, including a fresh install of version 1.0.2, I can only get a few monuments to auto spawn on the Last Train map. These are the monuments that always spawn:
 

[DynamicMonuments] The spawn of monuments has begun!
[DynamicMonuments] cargo is spawned at grid M30
[DynamicMonuments] oilPlatform is spawned at grid B14
[DynamicMonuments] cargo is spawned at grid A18
[DynamicMonuments] pirs is spawned at grid O23
[DynamicMonuments] strandedBarge is spawned at grid S5
[DynamicMonuments] Couldn't find a suitable position to spawn the monunent! (Oxide.Plugins.DynamicMonuments+SummonMonumentConfig)
[DynamicMonuments] Couldn't find a suitable position to spawn the monunent! (Oxide.Plugins.DynamicMonuments+SummonMonumentConfig)
[DynamicMonuments] Couldn't find a suitable position to spawn the monunent! ()
[DynamicMonuments] Couldn't find a suitable position to spawn the monunent! ()
[DynamicMonuments] The spawn has ended!
[DynamicMonuments] Couldn't find a suitable position to spawn the monunent! ()

Any monuments I place with commands disappear on server restarts. I'm wondering if this is a specific map issue. The issue is tracked here - https://codefling.com/files/support/20009-dynamic-monuments-respawn-on-server-restart/

Here are my config settings for reference -

(changing the min/max just leads to multiple spawns of the same monuments listed above)
 

"Prefix of messages": "[DynamicMonuments]",
  "Main Settings": {
    "Recreate locations on every plugin restart [true/false]": false,
    "The maximum number of locations that one player can summon (-1 - not limited)": -1,
    "Quickly build the location if triggered by a player [true/false]": true,
    "Enable monument spawn logging [true/false]": true
  },
  "Additional Respawn settings": {
    "Allow spawn of monuments from the list below? [true/false]": false,
    "A list of locations that will spawn in addition to random ones [presetName - amount]": {
      "submarine": 2,
      "highHouse": 2,
      "pirs": 1
    }
  },
  "Coastal Monuments": {
    "Allow automatic spawn? [true/false]": true,
    "The minimum number of locations": 2,
    "The maximum number of locations": 2,
    "List of locations": [

Since Gruber was the creator of Last Train and a contributor on Dynamic Monuments, I assumed this plugin would work great on that map. 

I'm not sure if this is a plugin issue or not, but I figured I would share the issue just in case.

DynamicMonuments.json

Hi!
You're right, not all monuments can spawn on this map because it's quite old.
Some locations depend on prefabs on the map, such as bus stops or substations.
On some maps, these objects might simply not exist.
7 out of 20 monuments cannot spawn on this map.

If this is very important to you, you can ask the map developer to add the necessary prefabs there.

Changed Status from Pending to Closed