Hey. So i found the Problem.
If you have Duplicated Lootable crates then the Loot is not Stackable from the Duplicated Crate with the Normal Crates.
For Example: You can Stack Loot from that Crate with every other Loot.
"Preset Name": "Militär_crate", "Prefab": "assets/bundled/prefabs/radtown/crate_normal.prefab",
But if you have a Duplicated Loot Crate like this:
"Preset Name": "Militär_crate_easy", "Prefab": "assets/bundled/prefabs/radtown/crate_normal.prefab",
You are not able to Stack the Loot with any other Loot at all.
I don't know if you able to fix tis or not, but it is sadly frustrating espacily if you have 5 different Tiers and you want to have Loot for each individually Tier.
I tried also to put the Big Gift from the Santa Sleigh Event on there but the Gift will not appear on the wagons every time.
Only sometimes the Gift is on the wagon but not lootable.