Consider adding `TechType.Constructor` (Mobile Vehicle Bay) to progression entities.

[Dintanthrir]

TechType.Constructor is not one of the progression entities in

SubnauticaRandomiser/SubnauticaRandomiser/Logic/ProgressionManager.cs

Line 258 in 880ad0d

/// Define the entities which progress the game state, i.e. "unlock" other entities. Mostly characterised

As a result we can get cases where building a Mobile Vehicle Bay requires diving to depths which are assumed to be reachable via access to the vehicles which require it.

For example in a recent game I got the spoiler logs below which gave me these fragment locations:

Fragment           | Locations (SubnauticaRandomiser.Objects.Biome Depth)
-------------------|-----------------------------------------------------
Seaglide           | Grand Reef (300), Mushroom Forest (150), Dunes (200), SparseReef (100)
PRAWN              | Mushroom Forest (150), Safe Shallows (0), Kelp (50)
Seamoth            | Safe Shallows (0), Mountains (200), Sea Treader Path (200), Crag Field (200)
Mobile Vehicle Bay | Dunes (200), Grand Reef (300), Mushroom Forest (150)

It looks like ProgressionManager calculates a reachable depth based on the unlocked vehicles but I wasn't actually able to construct them without the prerequisite Vehicle Bay. My actual progression required unlocking the rebreather and tank and fin upgrades in order to reach my final required fragments in the grand reef.
Reading the code I can't be sure if the intended progression path even considers the potentially randomized data box locations or only fragments so I'm not sure if you could get stuck needing a stack of basic tanks to reach data boxes and fragments only found in deeper biomes.

To be clear, this wasn't an actual soft lock but it did add a greater challenge than the calculated reachable depth showed and means randomized games may not play out the way the intended progression path suggests.
Including the Vehicle Bay as a progression entity would push the vehicles toward deeper zones and increase the chance that a player uses all of them to progress gradually rather than gaining access to them all at once when the Vehicle Bay is finally unlocked. I'm not sure if it would be better to get the Vehicle Bay early (implementing it as a prerequisite for the vehicles), when the player cannot use it yet because they have not unlocked any vehicles, or after unlocking a vehicle (not counting the vehicle towards reachable depth until it has been unlocked).

Hopefully all of that makes sense 😵

*************************************************
*****   SUBNAUTICA RANDOMISER SPOILER LOG   *****
*************************************************

Generated on 2/2/2025 1:32:35 PM with v0.12.0


Craft SeaglideFragment to reach 106m
Unlocked LaserCutterFragment.
Craft ExosuitFragment to reach 1700m
Unlocked SeamothFragment.
Unlocked PropulsionCannonFragment.
Unlocked CyclopsBridgeFragment.
Unlocked CyclopsEngineFragment.
Unlocked CyclopsHullFragment.

*************************************************
*****   SUBNAUTICA RANDOMISER SPOILER LOG   *****
*************************************************

Generated on 2/2/2025 1:32:35 PM with v0.12.0


///// Fragment Locations /////
// Note: Biomes which end in _TechSite are the big, explorable wrecks.
//       Biomes which end in _TechSite_Barrier are inside the wrecks, behind laser cutter doors.
//       Biomes which end in _TechSite_Scatter are medium-sized Aurora debris out in the open.

BaseBioReactorFragment: GrandReef_TechSite_Barrier, Kelp_GrassSparse, CragField_Grass, Dunes_TechSite_Scatter, GrassyPlateaus_TechSite_Barrier, 
BaseMapRoomFragment: Dunes_TechSite_Scatter, CragField_Sand, KooshZone_TechSite_Barrier, SeaTreaderPath_TechSite_Barrier, 
BaseNuclearReactorFragment: Kelp_GrassDense, Dunes_TechSite_Barrier, Mountains_TechSite_Barrier, GrassyPlateaus_TechSite, 
BatteryChargerFragment: DeepGrandReef_AbandonedBase_Exterior, Kelp_GrassDense, MushroomForest_Sand, Kelp_TechSite_Scattered, 
BeaconFragment: UnderwaterIslands_TechSite_Barrier, GrassyPlateaus_TechSite_Barrier, Dunes_TechSite, GrassyPlateaus_TechSite, SparseReef_Techsite_Scatter, 
ConstructorFragment: Dunes_TechSite_Barrier, GrandReef_Ground, MushroomForest_TechSite_Barrier, 
CyclopsBridgeFragment: Kelp_TechSite_Barrier, SeaTreaderPath_TechSite, Kelp_TechSite, 
CyclopsEngineFragment: Kelp_TechSite_Barrier, GrassyPlateaus_TechSite_Barrier, Kelp_TechSite_Scattered, SeaTreaderPath_Grass, KooshZone_TechSite, 
CyclopsHullFragment: Kelp_TechSite_Barrier, SafeShallows_TechSite, KooshZone_TechSite, 
ExosuitDrillArmFragment: SparseReef_Techsite, KooshZone_TechSite, GrandReef_TechSite_Scattered, UnderwaterIslands_TechSite_Barrier, 
ExosuitFragment: MushroomForest_Grass, SafeShallows_TechSite_Scattered, Kelp_TechSite_Scattered, 
ExosuitGrapplingArmFragment: GrassyPlateaus_TechSite, BloodKelp_TechSite, CrashZone_Sand, 
ExosuitPropulsionArmFragment: Kelp_GrassSparse, CragField_Ground, MushroomForest_Grass, KooshZone_TechSite_Scatter, 
ExosuitTorpedoArmFragment: MushroomForest_TechSite, JellyShroomCaves_AbandonedBase_Outside, GrandReef_TechSite_Scattered, SafeShallows_TechSite_Barrier, GrandReef_TechSite_Barrier, 
GravSphereFragment: GrandReef_Ground, BloodKelp_TechSite, KooshZone_TechSite_Scatter, CragField_Grass, GrassyPlateaus_Sand, 
LaserCutterFragment: MushroomForest_Grass, GrassyPlateaus_Grass, GrassyPlateaus_TechSite_Scattered, SeaTreaderPath_Sand, MushroomForest_Sand, 
LEDLightFragment: DeepGrandReef_AbandonedBase_Exterior, CragField_Sand, SeaTreaderPath_Sand, 
MoonpoolFragment: GrassyPlateaus_Grass, MushroomForest_TechSite_Barrier, SparseReef_Techsite, 
PowerCellChargerFragment: CragField_Grass, Mountains_TechSite_Scatter, Mountains_TechSite, FloatingIslands_AbandonedBase_Outside, 
PowerTransmitterFragment: BloodKelp_TrenchFloor, Dunes_TechSite_Scatter, SeaTreaderPath_Grass, JellyShroomCaves_AbandonedBase_Outside, 
PropulsionCannonFragment: CrashZone_Sand, Kelp_GrassDense, Mountains_TechSite_Barrier, SeaTreaderPath_TechSite_Barrier, GrandReef_TechSite_Barrier, 
SeaglideFragment: GrandReef_TechSite, MushroomForest_Grass, GrandReef_Grass, Dunes_TechSite, SparseReef_Techsite_Scatter, 
SeamothFragment: SafeShallows_TechSite_Barrier, Mountains_TechSite_Scatter, SeaTreaderPath_Grass, SeaTreaderPath_TechSite_Scatter, CragField_Sand, 
StasisRifleFragment: UnderwaterIslands_TechSite, DeepGrandReef_AbandonedBase_Exterior, FloatingIslands_AbandonedBase_Outside, Mountains_TechSite_Barrier, CragField_Ground, 
ThermalPlantFragment: GrassyPlateaus_Sand, SeaTreaderPath_TechSite_Scatter, Kelp_GrassSparse, KooshZone_TechSite_Scatter, 
WorkbenchFragment: SparseReef_Techsite_Barrier, SeaTreaderPath_Grass, Mountains_TechSite_Barrier, CragField_Grass, Mountains_TechSite_Scatter, 

[tinyhoot]

Thanks for the detailed report. I managed to reproduce the issue. It's less so caused by the Constructor not being part of progression entities and more so that fragments in general don't have any requirements set beyond their vanilla depth. Compare the requirements for ExosuitFragment and Exosuit itself:

SubnauticaRandomiser/SubnauticaRandomiser/Assets/recipeInformation.csv

Line 90 in 6606bed

Exosuit,Vehicles,300,Constructor,475,,ExosuitFragment,179

SubnauticaRandomiser/SubnauticaRandomiser/Assets/recipeInformation.csv

Line 256 in 6606bed

ExosuitFragment,Fragments,100,,475,,,

This is a holdover from the times when it was not possible to randomise fragments without also randomising recipes, whose additional rules and structure prevent the issue from happening.

As for fixing this, adding the constructor to progression would fix the problem in this instance but leave the wider issue unresolved. Considering that we're not dealing with a critical issue (softlock) I'd like to avoid that.
Unfortunately, the core logic is not equipped to properly handle entities with prerequisites which it is not supposed to touch (as is the case with recipes like the constructor in fragment-only runs). This'll require a bit of a rework to completely decouple entities from the concepts of recipes, fragments, and databoxes.