Issue description
Attempting to turn a 1-long transport into a connector by connectiong to it causes "invalid connection".
There is workarounds, but those require more effort for the player.
This issue has been around quite long, 4.10 or older ...
Expected behavior
Connecting another transport to a 1-long transport shall be possible.
Reproduction steps
Connect two buildings with a 1-long transport.
Connect another transport to that transport.
Game version
v0.4.10