TL;DR
Allow signs on the side of the rails to limit length of trains that can go through

What ?
Create another type of an entity like signals that can be placed near rails - train length sign - that will tell the A* consider connection to the next block non existing if the train it is finding ...

Easy way to reproduce the issue is unbinding the keys for copy-pasting.

Even if you do that, you still will be able to copy paste the filters using the stack transfer / stack split hotkeys.

Hello, I was having the same issue and also verified that wagon slot pasting is using the wrong thing

https://clips.twitch.tv/RealStylishSeah ... _UMGRLw53N