[110.0.1 and r4384] - Sign under public station becomes name when made public

[Fifty]

I discovered this problem on prissi's netgame server when I put some humorous "advertising" billboards near a public station, and then built another station on top of the signs and connected it to the public station the usual way. However, instead of keeping the name of the original public station, it kept the name of the sign which was underneath the first tile built, even when the sign was deleted. I have since used this bug to fix the name back to something more sensible.

Perhaps a way to avoid this problem is to disallow building stations on signs of the same player altogether.