This is a crazy one.
I made a german tutorial video about this mod and my carts when throu doors without problems in the video.
A viewer told me that his carts wont go through doors.
I was stunned because I was sure it worked on my side...
Well to make the story short ...
In MY game the carts went through doors without problems because there was an invisible neutral player entity in the carts (when they get destroyed by driving against a wall to often they leave a player charakter behind where they die)
So the gate thinks the cart is driven by a human / player and opens. It even triggeres the circuit signal where doors check in a radius if a player is nearby.
But after loading the map from the video and placing NEW carts they did not have any players in them and would not drive through doors ... that was VERY strange.
Same Map > Old Carts move through doors (with "ghostplayer" in them), New Carts wont (because no "ghostplayer" in them)
I have 0 idea what changed ... I used all the mods I used in the first place when I was creating the video ... that is so wired ^^