[0.17.58] Player can walk through boiler connection

[allobrox]

Problem:
Player can walk through boiler connection
video

How to reproduce:
- Connect two boilers directly by their "water pipe"
- Walk through the connected pipe between them

Expected behavior:
Player unable to walk through the pipe

[ndh]

Not a bug. For reference:

> I explicitly made boilers work this way to prevent complications with the boilers now being 3x2 entities.

https://forums.factorio.com/viewtopic.php?t=44622