Different parts of the train get culled, resulting in different parts of it getting stretched all around, making the train incredibly confusing to use.

Can confirm. Adding to whitelist will likely help but I can't identify what it is called. Any tips?

Right. Just knowing what the entity is called would be a great help.

Can confirm. Adding to whitelist will likely help but I can't identify what it is called. Any tips?

I found out what the Blockentity is called, it's create:carriage_contraption, apparently.

Hm I've assumed that Create in its latest versions should work correctly, but apparently not. I can put some more create stuff into the whitelist for the next release.

Awesome, thanks TR!

In the meantime, at least we can fix it ourselves with that whitelist item!

I assume this was left open on accident?